I made the main menu in BFNS Remastered by first creating a main menu script (you can view it here: https://pastebin.com/EN7qhFeT) and then I made it so when you click/tap one of the buttons that isn't the play or credits button, the menu camera plays one of its movement animations and the main menu UI gets disabled and once the menu camera finishes its movement animation, the new UI screen gets enabled (achievements screen, settings screen, etc). Each UI screen also has its own script starting with MainMenu (MainMenuAchievements, MainMenuItemAlmanac, etc). This might sound complicated, but hopefully you understand.