diff --git a/packages/hydrooj/package.json b/packages/hydrooj/package.json
index 5d58b4daf..bc1e3bf08 100644
--- a/packages/hydrooj/package.json
+++ b/packages/hydrooj/package.json
@@ -1,6 +1,6 @@
 {
     "name": "hydrooj",
-    "version": "2.29.37",
+    "version": "2.29.38",
     "bin": "bin/hydrooj.js",
     "main": "dist/loader.js",
     "typings": "dist/loader.d.ts",
diff --git a/packages/hydrooj/src/handler/problem.ts b/packages/hydrooj/src/handler/problem.ts
index f9cdee063..c21b57d21 100644
--- a/packages/hydrooj/src/handler/problem.ts
+++ b/packages/hydrooj/src/handler/problem.ts
@@ -562,6 +562,18 @@ export class ProblemCreateHandler extends Handler {
 export class ProblemPrefixListHandler extends Handler {
     @param('prefix', Types.Name)
     async get(domainId: string, prefix: string) {
+        let cors = false;
+        if (prefix.includes(':')) {
+            const [pdomain, s] = prefix.split(':');
+            const ddoc = await domain.get(pdomain);
+            this.response.body = [];
+            if (!ddoc || ddoc._id === domainId || !ddoc.share || !s.trim()) return;
+            ddoc.share = ddoc.share.replace(/，/g, ',').split(',').map((q) => q.trim()).join(',');
+            if (ddoc.share !== '*' && !`,${ddoc.share},`.includes(`,${domainId},`)) return;
+            domainId = pdomain;
+            prefix = s;
+            cors = true;
+        }
         const pdocs = await problem.getPrefixList(domainId, prefix);
         if (!Number.isNaN(+prefix)) {
             const pdoc = await problem.get(domainId, +prefix, ['domainId', 'docId', 'pid', 'title']);
@@ -576,6 +588,7 @@ export class ProblemPrefixListHandler extends Handler {
             }
         }
         this.response.body = pdocs;
+        if (cors) this.response.body.forEach((v) => { v.docId = `${domainId}:${v.docId}`; });
     }
 }
 
diff --git a/packages/ui-default/package.json b/packages/ui-default/package.json
index 026df20c4..8d2338be4 100644
--- a/packages/ui-default/package.json
+++ b/packages/ui-default/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@hydrooj/ui-default",
-  "version": "4.13.2",
+  "version": "4.13.3",
   "author": "undefined <i@undefined.moe>",
   "license": "AGPL-3.0",
   "main": "hydro.js",
diff --git a/packages/ui-default/pages/problem_main.page.js b/packages/ui-default/pages/problem_main.page.js
index 247bb9a6a..f090a34a5 100644
--- a/packages/ui-default/pages/problem_main.page.js
+++ b/packages/ui-default/pages/problem_main.page.js
@@ -214,6 +214,7 @@ const page = new NamedPage(['problem_main', 'problem_category'], () => {
   $('[name="hide_selected_problems"]').on('click', () => handleOperation('hide'));
   $('[name="unhide_selected_problems"]').on('click', () => handleOperation('unhide'));
   $('[name="download_selected_problems"]').on('click', handleDownload);
+  $('#hideTags').on('click', () => $('.problem__tags').hide());
   $('#search').on('click', (ev) => {
     ev.preventDefault();
     updateSelection();
diff --git a/packages/ui-default/templates/partials/problem_list.html b/packages/ui-default/templates/partials/problem_list.html
index 0d488aaeb..e362168f9 100644
--- a/packages/ui-default/templates/partials/problem_list.html
+++ b/packages/ui-default/templates/partials/problem_list.html
@@ -22,18 +22,18 @@
     </colgroup>
     <thead>
       <tr>
-      {% if handler.user.hasPerm(perm.PERM_EDIT_PROBLEM) %}
-        <th class="col--checkbox display-mode-hide">
-          <label class="compact checkbox">
-            <input type="checkbox" name="select_all" data-checkbox-toggle="problem">
-          </label>
-        </th>
-        <th class="col--pid display-mode-hide">{{ _('ID') }}</th>
-      {% endif %}
-      {% if handler.user.hasPriv(PRIV.PRIV_USER_PROFILE) %}
-        <th class="col--status record-status--border edit-mode-hide">{{ _('Status') }}</th>
-      {% endif %}
-        <th class="col--name">{{ _('Problem') }}</th>
+        {% if handler.user.hasPerm(perm.PERM_EDIT_PROBLEM) %}
+          <th class="col--checkbox display-mode-hide">
+            <label class="compact checkbox">
+              <input type="checkbox" name="select_all" data-checkbox-toggle="problem">
+            </label>
+          </th>
+          <th class="col--pid display-mode-hide">{{ _('ID') }}</th>
+        {% endif %}
+        {% if handler.user.hasPriv(PRIV.PRIV_USER_PROFILE) %}
+          <th class="col--status record-status--border edit-mode-hide">{{ _('Status') }}</th>
+        {% endif %}
+        <th class="col--name">{{ _('Problem') }}<span style="float:right" id="hideTags">{{ _('Hide tags') }}</span></th>
         <th class="col--tried">{{ _('Tried') }}</th>
         <th class="col--ac">{{ _('AC') }}</th>
         <th class="col--difficulty">{{ _('Difficulty') }}</th>
diff --git a/packages/ui-default/templates/problem_main.html b/packages/ui-default/templates/problem_main.html
index 5431cbf78..fa3444d3c 100644
--- a/packages/ui-default/templates/problem_main.html
+++ b/packages/ui-default/templates/problem_main.html
@@ -13,7 +13,7 @@
         <div class="section__body no-padding">
           <form method="get" id="searchForm" action="{{ url('problem_main') }}">
             <div class="search">
-              <input name="q" type="text" value="{{ category }}" placeholder="1001">
+              <input name="q" type="text" value="{{ category }}" placeholder="{{ _('Search') }}">
               {% include "partials/problem_stat.html" %}
               <button type="submit">
                 <span class="icon icon-search"></span>