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src/views/prepare-lessons/components/resource-main/components/resource-item/resource-search-group/index.tsx

@@ -115,6 +115,7 @@ export default defineComponent({
                   { id: '', name: '全部教材' },
                   ...catchStore.getMusicTagTree
                 ]}
+                clearable
                 style={{ width: '100%' }}
                 childrenField="children"
                 valueField="id"

src/views/prepare-lessons/components/resource-main/components/select-music/resource-search-group/index.tsx

@@ -80,6 +80,7 @@ export default defineComponent({
                   { id: '', name: '全部教材' },
                   ...catchStore.getMusicTagTree
                 ]}
+                clearable
                 style={{ width: '100%' }}
                 childrenField="children"
                 valueField="id"