Hello,

I have test our demo as well as my test site. The tabs goes hidden while we resizing the window screen but shown just fine when we check on actual screens like iPad, mobile etc.

Screenshots for clarification: https://jmp.sh/4bFFRPu
Screenshot of all the tabs: https://jmp.sh/lGYVNFa

This is not a bug, It seems it is designed in this way, So there is nothing to fix.

Best Regards.