Just something interesting that came up in testing and might help some. On Communication Sites, if you want the new Full Width layout with no banner for some of your pages then if you create them from powershell you can set the PageLayout to Home which will give you these features.
On an old classic site this will get rid of the banner and give you a tighter layout but you will still have the collaboration sidebar of course.
Add-PnPClientSidePage -Name "My Comms Page" -LayoutType Home
