When I try to adjust a Camera position with the arrow keys, they also move the Sequencer’s position frame at the same time, even if the Sequencer’s tab is not selected. Shouldn’t the keys just have one function at the time based on the window selected?
Yes, this is a bug in the Cinematic Viewport. Since the Cinematic Viewport has Sequencer timeline navigation buttons, shortcuts are being forwarded for those as well. I think it makes sense to NOT forward some of the common viewport shortcuts (up/down/left/right) to the Sequencer timeline in this case. We should be able to address this in the next 4.26 hotfix.
Thanks again Max!