are you using Photoshop 2021? Does your OLD computer allow you to install the NEW Photoshop?
You can also try deleting Photoshop's preferences by quitting Photoshop and then restarting it again while holding down Command+Option+ Shift (control+alt+shift on PC) or by pressing Command K(control K on PC) and select "Reset Preferences on Quit"
hope that helps, mark
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