I strongly recommend asking your cabin crew for permission before taking an empty seat. We dislike it very much when passengers move to open exit row seats without speaking to the crew.
Once on the plane, you can ask the crew if any rows are available for you to sit alone - it's usually fine.
Waiting until the last second to board can also cause unnecessary stress for the staff.
You can sit in any open row you see available without going to your seat first... now you can choose any open seat if the flight's not full.
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