FileExplorer enabled setting is never set to False

[JFoederer]

By default the File Explorer is opened, which is also stored in the settings.cfg file. Unless this file edited manually there is no way to persist the opened setting at value False. I would expect that if the File Explorer is closed using the cross on the panel or by toggling it from the View menu, that this choice is remembered.

[HelioGuilherme66]

The File Explorer is a Plugin, and the Enable state stored in settings.cfg is the Plugin state. If we Disable the Plugin, then the Menu option is removed.

The toggle idea, to Show/Hide the File Explorer (and maybe the Project Explorer) and persist this state, is a good idea.