Launchpad
When I click the launchpad icon on the dock, list opens instead of a page - what has happened and how do I get the page view back?
By default, single click opens the page.
Control click opens the list.
When list is open, try clicking the"Show Launchpad" at the bottom.
Try startup in safe mode.
Startup in Safe Mode. https://support.apple.com/guide/mac-help/start-up-your-mac-in-safe-mode-mh21245/mac.
Quote:
It also does a basic check of your startup disk, similar to using First Aid in Disk Utility.
And it deletes some system caches, including font caches and
the kernel cache, which are automatically created again as needed.