Сделал сворачивание через меню настроек.

src/Visual_DVM_2021/UI/Main/ProjectForm.java

@@ -85,9 +85,9 @@ public class ProjectForm implements FormWithSplitters, ProjectWindow {
         SwitchScreen(Global.db.settings.get(SettingName.SmallScreen).toBoolean());
         RefreshTabsNames();
         //--
-        UI.mainMenuBar.RightECButton.Switch(Global.properties.collapseProjectTrees);
         if (Global.properties.collapseProjectTrees)
             CollapseProjectTrees();
+        //--
     }
     @Override
     public void SaveSplitters() {
@@ -306,15 +306,4 @@ public class ProjectForm implements FormWithSplitters, ProjectWindow {
         projectBackground.add(SC3);
         projectBackground.updateUI();
     }
-    @Override
-    public void SwitchProjectTrees() {
-        if (Global.properties.collapseProjectTrees)
-            ExpandProjectTrees();
-        else
-            CollapseProjectTrees();
-        //---------------
-        Global.properties.collapseProjectTrees =!Global.properties.collapseProjectTrees;
-        Global.properties.Update();
-        UI.mainMenuBar.RightECButton.Switch(Global.properties.collapseProjectTrees);
-    }
 }