The minimap that shows the terrain is a plugin that you can simply switch off in the plugin manager.
The minimap that shows all the rooms is a Common Event that you can clear in "database -> Common Events".
Viewing post in [RPGMaker MV & MZ] Random Maps comments
The current solution that uses the plugin manager does not well support variables. I'm aware of it, however, older solutions that were more based on programming overwhelmed a lot of people.
It may come in the future but I would need to design ways first that are intuitive and accessible for everyone.