Layout Preview 4.10

on the layout page there are 3 options to preview the layout. Phone, Tablet and Desk top. Where can I find instructions for how to use these previews to view the different views? I have tried to find this in the documentation but I can't find it.

Thank you

screenshot of layout w edit layout phone preview tablet preview etc.png

This option just hides corresponding blocks from the block manager

https://prnt.sc/otc23o