Some tips to improve a small app!

[TIMAI2]

See here for an aia project example, that demonstrates one way to switch screens

Any good reason because my aia does not open an existing screen?

Try this: TestNestingScreens_revised.aia (15.5 KB) Screen1 remains open to stop it be re-initialised when returning from Main. (Hence the use of tinydb on Screen1 and Main) All other screens are closed when another screen is opened. To test, you will need to compile to an apk for this to work properly.