You probably do not need to create 40 more screens. More than 10 screens often causes issues with some apps for various reasons, that is why MIT recommends no more than 10 Screens. AI2 frequently becomes unstable when more than ten screens are used. Projects CAN be built with slightly more screens but then you should expect your app to occasionally behave erratically. Do not ignore the warning message that appears when you attempt to load your 11th Screen.
Nonetheless, see Are App Inventor Projects Limited to 10 Screens? - #7 by ewpatton or use virtual screens or re-use existing screens.