Split screen view not working

I have a MacBook Air (Early 2014) and recently updated to macOS Big Sur version 11.6.5. Prior to the update, I was able to use the split screen view, but it has stopped working since I updated the software a couple of days ago. I have restarted my MacBook Air since the update, and ensured the "Displays have separate Spaces" box is still ticked in the Mission Control section of Systems Preferences.

Is there anything that can be done to restore the split screen view on my MacBook?