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Thanks for comments, they were very helpful . ie while trying to document the problem, to present to you , the solution become obvious to me. Sorry , new to this, problem solved when i made a new simple app to test . i guess "go invisible and lock screen" did the trick. Thanks , and keep working on ...

buttons and fields dissappear after returning from a substack and show substacks card in the background.
i have set substacks to not visible but still same problem.

Thanks in advanced