Many screens are bad, but to avoid screens you need a large designer on the same screen, so the companion starts to show anomalies, also needs more blocks, which slows everything down.
This is true of all the AppInventor tools I have used. Use AppInventor from before you can create new screens.
That’s why I proposed these things:
Honestly, I do not understand how the first two proposals do not exist. Is it just me who suffers from it?