There are no FF8 style menus associated with Bootleg. If you checked the boxes for FFX Battle Style in the Overhaul tab, then you have FFX and FFIX (default) style menus installed. If you checked the box for Style Switcher, then you can switch between them using the following key combinations:
CTRL+F5 (FFX Battle Menu w/o 9999 Break), CTRL+F7 (FFX Battle Menu w/ 9999 Break)
CTRL+F6 (FFIX Battle Menu w/o 9999 Break), CTRL+F8 (FFIX Battle Menu w/ 9999 Break)
There is no way to revert back to the classic menus without starting completely over. If you do this, leave the Overhaul tab alone and unchecked.