diff --git a/frontend/components/tasks/toolbar/buttons/ButtonFilter.vue b/frontend/components/tasks/toolbar/buttons/ButtonFilter.vue
index a161d11b..053bebf9 100644
--- a/frontend/components/tasks/toolbar/buttons/ButtonFilter.vue
+++ b/frontend/components/tasks/toolbar/buttons/ButtonFilter.vue
@@ -51,8 +51,8 @@ export default {
     return {
       items: [
         { title: this.$t('annotation.filterOption1'), param: '' },
-        { title: this.$t('annotation.filterOption2'), param: 'false' },
-        { title: this.$t('annotation.filterOption3'), param: 'true' }
+        { title: this.$t('annotation.filterOption2'), param: 'true' },
+        { title: this.$t('annotation.filterOption3'), param: 'false' }
       ]
     }
   },
diff --git a/frontend/composables/useExampleItem.ts b/frontend/composables/useExampleItem.ts
index b814bfd3..b6e4faab 100644
--- a/frontend/composables/useExampleItem.ts
+++ b/frontend/composables/useExampleItem.ts
@@ -13,10 +13,9 @@ export const useExampleItem = () => {
 
   const getExample = async(
     projectId: string,
-    filterOption: string,
     { page, q, isChecked }: { page: string, q: string, isChecked: string}
   ) => {
-    const examples = await exampleService.fetchOne(projectId, page, q, isChecked, filterOption)
+    const examples = await exampleService.fetchOne(projectId, page, q, isChecked)
     state.totalExample = examples.count
     if (!_.isEmpty(examples) && examples.items.length !== 0) {
       state.example = examples.items[0]
diff --git a/frontend/domain/models/example/exampleRepository.ts b/frontend/domain/models/example/exampleRepository.ts
index 37512d08..c4d564ee 100644
--- a/frontend/domain/models/example/exampleRepository.ts
+++ b/frontend/domain/models/example/exampleRepository.ts
@@ -3,7 +3,7 @@ import { ExampleItem, ExampleItemList } from '~/domain/models/example/example'
 export type SearchOption = {[key: string]: string | (string | null)[]}
 
 export interface ExampleRepository {
-  list(projectId: string, { limit, offset, q, isChecked, filterName }: SearchOption): Promise<ExampleItemList>
+  list(projectId: string, { limit, offset, q, isChecked }: SearchOption): Promise<ExampleItemList>
 
   create(projectId: string, item: ExampleItem): Promise<ExampleItem>
 
diff --git a/frontend/domain/models/project/project.ts b/frontend/domain/models/project/project.ts
index a37c5eba..d8c6f628 100644
--- a/frontend/domain/models/project/project.ts
+++ b/frontend/domain/models/project/project.ts
@@ -106,22 +106,6 @@ export class ProjectReadItem {
     return allowedProjectTypes.includes(this.project_type)
   }
 
-  get filterOption() {
-    if (this.project_type === 'DocumentClassification') {
-      return 'categories__isnull'
-    } else if (this.project_type === 'SequenceLabeling') {
-      return 'spans__isnull'
-    } else if (this.project_type === 'Seq2seq') {
-      return 'texts__isnull'
-    } else if (this.project_type === 'ImageClassification') {
-      return 'categories__isnull'
-    } else if (this.project_type === 'Speech2text') {
-      return 'texts__isnull'
-    } else {
-      return ''
-    }
-  }
-
   toObject(): Object {
     return {
       id: this.id,
diff --git a/frontend/pages/projects/_id/image-classification/index.vue b/frontend/pages/projects/_id/image-classification/index.vue
index a6e194b8..31352d2d 100644
--- a/frontend/pages/projects/_id/image-classification/index.vue
+++ b/frontend/pages/projects/_id/image-classification/index.vue
@@ -106,8 +106,7 @@ export default {
       this.projectId,
       this.$route.query.page,
       this.$route.query.q,
-      this.$route.query.isChecked,
-      this.project.filterOption
+      this.$route.query.isChecked
     )
     const image = this.images.items[0]
     this.setImageSize(image)
diff --git a/frontend/pages/projects/_id/sequence-labeling/index.vue b/frontend/pages/projects/_id/sequence-labeling/index.vue
index 89db52e6..ecf0e6ce 100644
--- a/frontend/pages/projects/_id/sequence-labeling/index.vue
+++ b/frontend/pages/projects/_id/sequence-labeling/index.vue
@@ -75,8 +75,7 @@ export default {
       this.projectId,
       this.$route.query.page,
       this.$route.query.q,
-      this.$route.query.isChecked,
-      this.project.filterOption
+      this.$route.query.isChecked
     )
     const doc = this.docs.items[0]
     if (this.enableAutoLabeling) {
diff --git a/frontend/pages/projects/_id/sequence-to-sequence/index.vue b/frontend/pages/projects/_id/sequence-to-sequence/index.vue
index 4789a89e..117b894b 100644
--- a/frontend/pages/projects/_id/sequence-to-sequence/index.vue
+++ b/frontend/pages/projects/_id/sequence-to-sequence/index.vue
@@ -59,8 +59,7 @@ export default {
       this.projectId,
       this.$route.query.page,
       this.$route.query.q,
-      this.$route.query.isChecked,
-      this.project.filterOption
+      this.$route.query.isChecked
     )
     const doc = this.docs.items[0]
     if (this.enableAutoLabeling) {
diff --git a/frontend/pages/projects/_id/speech-to-text/index.vue b/frontend/pages/projects/_id/speech-to-text/index.vue
index 238fb66c..90169b36 100644
--- a/frontend/pages/projects/_id/speech-to-text/index.vue
+++ b/frontend/pages/projects/_id/speech-to-text/index.vue
@@ -62,8 +62,7 @@ export default {
       this.projectId,
       this.$route.query.page,
       this.$route.query.q,
-      this.$route.query.isChecked,
-      this.project.filterOption
+      this.$route.query.isChecked
     )
     const item = this.items.items[0]
     if (this.enableAutoLabeling) {
diff --git a/frontend/pages/projects/_id/text-classification/index.vue b/frontend/pages/projects/_id/text-classification/index.vue
index 81979cbf..84c515f3 100644
--- a/frontend/pages/projects/_id/text-classification/index.vue
+++ b/frontend/pages/projects/_id/text-classification/index.vue
@@ -102,7 +102,6 @@ export default {
     const { fetch } = useFetch(async() => {
       await getExample(
         projectId,
-        projectState.project.filterOption,
         query.value
       )
       if (enableAutoLabeling.value) {
diff --git a/frontend/repositories/example/apiDocumentRepository.ts b/frontend/repositories/example/apiDocumentRepository.ts
index 5f5f8eb7..3596c66b 100644
--- a/frontend/repositories/example/apiDocumentRepository.ts
+++ b/frontend/repositories/example/apiDocumentRepository.ts
@@ -8,8 +8,8 @@ export class APIExampleRepository implements ExampleRepository {
     private readonly request = ApiService
   ) {}
 
-  async list(projectId: string, { limit = '10', offset = '0', q = '', isChecked = '', filterName = '' }: SearchOption): Promise<ExampleItemList> {
-    const url = `/projects/${projectId}/examples?limit=${limit}&offset=${offset}&q=${q}&${filterName}=${isChecked}`
+  async list(projectId: string, { limit = '10', offset = '0', q = '', isChecked = '' }: SearchOption): Promise<ExampleItemList> {
+    const url = `/projects/${projectId}/examples?limit=${limit}&offset=${offset}&q=${q}&confirmed=${isChecked}`
     const response = await this.request.get(url)
     return ExampleItemList.valueOf(response.data)
   }
@@ -49,6 +49,6 @@ export class APIExampleRepository implements ExampleRepository {
 
   async confirm(projectId: string, exampleId: number): Promise<void> {
     const url = `/projects/${projectId}/examples/${exampleId}/states`
-    await this.request.post(url)
+    await this.request.post(url, {})
   }
 }
diff --git a/frontend/services/application/example/exampleApplicationService.ts b/frontend/services/application/example/exampleApplicationService.ts
index d57f1296..1959fec5 100644
--- a/frontend/services/application/example/exampleApplicationService.ts
+++ b/frontend/services/application/example/exampleApplicationService.ts
@@ -17,14 +17,13 @@ export class ExampleApplicationService {
     }
   }
 
-  public async fetchOne(projectId: string, page: string, q: string, isChecked: string, filterName: string): Promise<ExampleListDTO> {
+  public async fetchOne(projectId: string, page: string, q: string, isChecked: string): Promise<ExampleListDTO> {
     const offset = (parseInt(page, 10) - 1).toString()
     const options: SearchOption = {
       limit: '1',
       offset,
       q,
       isChecked,
-      filterName
     }
     return await this.list(projectId, options)
   }
diff --git a/frontend/services/application/project/projectData.ts b/frontend/services/application/project/projectData.ts
index d9e8ccab..b60658ea 100644
--- a/frontend/services/application/project/projectData.ts
+++ b/frontend/services/application/project/projectData.ts
@@ -13,7 +13,6 @@ export class ProjectDTO {
   singleClassClassification: boolean
   pageLink: string
   permitApprove: Boolean
-  filterOption: String
   tags: Object[]
   canDefineLabel: Boolean
   canDefineRelation: Boolean
@@ -31,7 +30,6 @@ export class ProjectDTO {
     this.singleClassClassification = item.single_class_classification
     this.pageLink = item.annotationPageLink
     this.permitApprove = item.permitApprove
-    this.filterOption = item.filterOption
     this.tags = item.tags
     this.canDefineLabel = item.canDefineLabel
     this.canDefineRelation = item.canDefineRelation