diff --git a/editor/gui/editor_scene_tabs.cpp b/editor/gui/editor_scene_tabs.cpp
index 4862b3436e18..e3cfbb024798 100644
--- a/editor/gui/editor_scene_tabs.cpp
+++ b/editor/gui/editor_scene_tabs.cpp
@@ -55,7 +55,10 @@ void EditorSceneTabs::_notification(int p_what) {
 
 			scene_tab_add->set_icon(get_editor_theme_icon(SNAME("Add")));
 			scene_tab_add->add_theme_color_override("icon_normal_color", Color(0.6f, 0.6f, 0.6f, 0.8f));
+			[[fallthrough]];
+		}
 
+		case NOTIFICATION_READY: {
 			scene_tab_add_ph->set_custom_minimum_size(scene_tab_add->get_minimum_size());
 		} break;
 
@@ -413,13 +416,13 @@ EditorSceneTabs::EditorSceneTabs() {
 
 	scene_tab_add = memnew(Button);
 	scene_tab_add->set_flat(true);
+	scene_tab_add->set_theme_type_variation("FlatMenuButton");
 	scene_tab_add->set_tooltip_text(TTR("Add a new scene."));
 	scene_tabs->add_child(scene_tab_add);
 	scene_tab_add->connect(SceneStringName(pressed), callable_mp(EditorNode::get_singleton(), &EditorNode::trigger_menu_option).bind(EditorNode::FILE_NEW_SCENE, false));
 
 	scene_tab_add_ph = memnew(Control);
 	scene_tab_add_ph->set_mouse_filter(Control::MOUSE_FILTER_IGNORE);
-	scene_tab_add_ph->set_custom_minimum_size(scene_tab_add->get_minimum_size());
 	tabbar_container->add_child(scene_tab_add_ph);
 
 	// On-hover tab preview.