修改

src/teacher/video-class/class-info.tsx

@@ -322,7 +322,7 @@ export default defineComponent({
           </div>
         </Sticky>
 
-        <ColPopup v-model={this.subjectStatus} destroy>
+        <ColPopup v-model={this.subjectStatus} destroy zIndex={9999999}>
           <ColHeader />
           <SubjectModel
             selectType="Radio"