App Inventor provides ability to set property of each component. For example, if you have 10 Buttons on your screen, you can set the visibility of each component as follows:
Button1.Visible to true, Button2.Visible to true and so on for all the buttons.
However, this would increase number of blocks and would be difficult to maintain. An alternative is to use the Advanced Features of App Inventor. Using “Any Component”, you can simplify setting property of the component (e.g. visibility, Enabled, etc) in a simple approach as below:
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Hossein Amerkashi's Blog 
VIJAY
December 18, 2017 at 4:18 am
THANKS
Hossein Amerkashi
December 18, 2017 at 6:08 am
Glad you like the post. Also, you can checkout forum at http://Community.AppyBuilder.com for discussions and tutorials
bayyou
November 3, 2017 at 8:38 am
Thanks, it’s helpful
Hossein Amerkashi
November 3, 2017 at 8:40 am
Glad you found it useful.
Please visit community.AppyBuilder.com . you’ll find great discussions and tutorials