What's fixed.
1. Fixed an issue with the removal of "Interface Transparency". When the delete mode is enabled, if you select another item, the element behind the button is deleted.
2. In the delete mode, when you hover the mouse over the object, it turns red.
3. When you press the item selection button or go to the menu. The delete mode is disabled automatically.
Special thanks to the user foofaraw for his invaluable help.