Remove questions from parent multi-variant sets

administrator/components/com_testquestions/tmpl/set/edit.php

@@ -44,6 +44,7 @@ HTMLHelper::_('behavior.formvalidator');
                 </a>
             </fieldset>
         <?php endif; ?>
+        <?php if (!((string) $this->item->set_type === 'multi' && (int) $this->item->parent_id === 0)) : ?>
         <fieldset class="mb-3">
             <legend><?php echo \Joomla\CMS\Language\Text::_('COM_TESTQUESTIONS_SET_SELECTED_QUESTIONS'); ?></legend>
             <div id="set-selected-question-list" class="border rounded p-3">
@@ -109,6 +110,11 @@ HTMLHelper::_('behavior.formvalidator');
                 <?php endforeach; ?>
             </div>
         </fieldset>
+        <?php else : ?>
+            <div class="alert alert-info">
+                <?php echo \Joomla\CMS\Language\Text::_('COM_TESTQUESTIONS_SET_MULTI_QUESTIONS_INFO'); ?>
+            </div>
+        <?php endif; ?>
     </fieldset>
     <input type="hidden" name="task" value="">
     <?php echo HTMLHelper::_('form.token'); ?>