I've fixed the admin page layout by:
SidebarInset to create the main content area that sits to the right of the sidebarThe layout now follows the proper sidebar pattern with:
The sidebar will automatically collapse on mobile devices and can be toggled using the hamburger menu button in the header.
Sources
I've updated the admin page layout to:
flex with the sidebar and content area as flex childrenflex-1) takes up the remaining space without overlapping the sidebarThe layout now has: