Responsive system

Hello, thanks for your powerful Response system I have questions about the size of app in different displays .We will make empty blocks for our margin and padding of our display they will be ok in tablets or any smart phone with different displays? And if I want to build, fix menu(modes names'tags') in one part of my display and other part change when we clicked for new tag

Have you read
http://appinventor.mit.edu/ai2/responsive-design-app.html
?

Hi Rez1

also see my tips:
https://www.professorcad.co.uk/appinventortips#TipsGui

That is effectively using the principle of Virtual Screens:
Think about using Virtual Screens. Screen1 is the ‘real’ Screen and device-sized Vertical Arrangements on it are displayed/hidden as required - they are the Virtual screens. Any settings made for Screen 1 apply to the Virtual screens too!

A tabbed example:
https://groups.google.com/forum/#!searchin/mitappinventortest/subject$3AHOWTO$3A$20AND$20authorname$3ATimAi2|sort:date/mitappinventortest/K-zAr2X3nio/PNUhnGz5BgAJ