Why will this square be left on the timeline ???????????????

Hey Paul,

I'm sorry about the issue. Please check the Creative Cloud App for Premiere Pro updates. This might be an issue that was fixed in the most recent version. I think it would be best to install it.

If you still see the problem, please go to Window > Workspaces and select another workspace.

If that doesn't help, please go to Edit > Preferences > General (Premiere Pro > Settings > General on macOS) and let me know if unchecking the "GPU accelerated UI rendering" option and restarting the app helps fix the problem.

Thanks,

Ishan

Please tag me (@) in your replies so that it notifies me and helps me respond promptly.

try to reset the preferences.

what are your system specs?