Hi @TFraser2,
I just tried this on my institution Canvas instance, and the Move To option functioned correctly on all three browsers I tried (Chrome, Edge, Firefox). I think this could either be an issue with the browser on your device (in which case trying to clear the browser cache or disabling browser extensions may help) or perhaps an issue with customizations your school/institution has made to Canvas with CSS or JavaScript (in which case you'll need to reach out to your school/institution Canvas team).
I know this doesn't solve the issue directly, but I hope the info helps.
-Chris