No - it'll close automagically. Just a quick note for those who might* care - if you're on an FSE flight and have a flap overspeed or crash on finals - don't disconnect from PE or end the FSE flight. If you were close enough to the field, it'll log it on both PE (auto) and FSE (in the latest client, manually with the use of a button). Just pretend you crashed and were rescued
*no one actually cares or asked, I like to metaphorically hear myself talk