Description of the need
To configure a layout's page title, you need to visit the "Configure page title" page at /admin/structure/layouts/manage/<layout-machine-name>/edit-title/editor/title. A menu item for that admin page appears in the Backdrop admin menu, but that's easy to miss; no tab appears on any of the other Layout admin pages to let you reach the "Configure page title" page.
Proposed solution Like "Manage blocks" and "Configure layout," a "Configure page title" tab should appear at the top of each layout's admin pages.
Recent comments
Probably not the reason, but worth to do a quick check: Sometimes the update cache interferes, so if something's odd with updates - some module (or core) claims to have updated, but then...
Update 1.35.1 appears to install but hasn't
Nope, not touched any permissions!
Update 1.35.1 appears to install but hasn't
Did it on my end on some sites without problem. I don't know why this update would be different for you. Perhaps some file permission changes?
Update 1.35.1 appears to install but hasn't