Fix: set min-height for drag-drop items container (#11064)

src-ui/src/app/components/common/input/drag-drop-select/drag-drop-select.component.html

@@ -14,7 +14,7 @@
     </div>
 </div>
 <div class="mt-2 align-items-center bg-light p-2">
-    <div class="d-flex flex-wrap flex-row gap-2 w-100"
+    <div class="d-flex flex-wrap flex-row gap-2 w-100" style="min-height: 1em;"
         cdkDropList #unselectedList="cdkDropList"
         cdkDropListOrientation="mixed"
         (cdkDropListDropped)="drop($event)"