Is not a stupid question. The FM vs reader menu confusion is common between new users of a feature. I wouldn't expect that any user that uses 100% of the features of program. That would be kinda insane
I, personally, disable all plugins I don't use, which are most of them, to find a lean menu.
On most devices you can fine tune your menus programatically, by editing
filemanager_menu_order.lua and
reader_menu_order.lua, but AFAIK this doesn't apply to the android port, because most lua files are stored in a read only environment.