My laptop did same thing got it back by hitting Fn bottom left corner then holding then hit F5 showed me displays then click single display hope this helps i have to do it when i change to smart tv screen.
It takes a special kind of person to lead! We all know this. Over the past 3 years or more, visitors to Acer Community were witness to a leader in our Top Ranked ACE member, IronFly. Recently he hit a new milestone of 1000 solutions authored. Leading the way has always been and continues to be his way. We are proud of you IronFly.