https://github.com/NodeBB/NodeBB/issues/8233

less/search.less

@@ -38,6 +38,9 @@
 	display: block;
 	left: auto;
 	right: 0px;
+	.filter-category {
+		padding-left: 20px;
+	}
 	.quick-search-results {
 		max-width: 400px;
 		max-height: 500px;

templates/partials/menu.tpl

@@ -174,6 +174,11 @@
 							</div>
 						</form>
 						<div id="quick-search-container" class="quick-search-container hidden">
+							<div class="checkbox filter-category">
+								<label>
+									<input type="checkbox" checked><span class="name"></span>
+								</label>
+							</div>
 							<div class="text-center loading-indicator"><i class="fa fa-spinner fa-spin"></i></div>
 							<div class="quick-search-results-container"></div>
 						</div>