The manager should sign off on tickets in the sprint review to make a scope for the sprint. They can specify priority on the tickets to infer an order of execut

The manager should sign off on tickets in the sprint review to make a scope for the sprint. They can specify priority on the tickets to infer an order of execution, but, all things considered, and providing tickets aren't interlinked and blocking, if the sprint scope has been realistically allocated and not overstuffed then you should be able to do your work as you please by the sprint end in any order. If the manager is changing sprint scope in scrums/daily stand-ups then they're being naughty. If they're policing order of execution, then maybe it's ok, but they should do that at planning time.