You're in luck. I literally just made an account for the forum to add it as an example and then I saw your post so thought I'd put it as a reply.
Project flyout- %windir%\System32\DisplaySwitch.exe
PC screen only- %windir%\System32\DisplaySwitch.exe /internal
Duplicate- %windir%\System32\DisplaySwitch.exe /clone
Extend- %windir%\System32\DisplaySwitch.exe /extend
Second screen only- %windir%\System32\DisplaySwitch.exe /external
Dunno if you still need this answer but for future reference (and in case others find this page) here are the commands for changing screen:
Project flyout- %windir%\System32\DisplaySwitch.exe
PC screen only- %windir%\System32\DisplaySwitch.exe /internal
Duplicate- %windir%\System32\DisplaySwitch.exe /clone
Extend- %windir%\System32\DisplaySwitch.exe /extend
Second screen only- %windir%\System32\DisplaySwitch.exe /external
You're in luck. I literally just made an account for the forum to add it as an example and then I saw your post so thought I'd put it as a reply.
Project flyout- %windir%\System32\DisplaySwitch.exe
PC screen only- %windir%\System32\DisplaySwitch.exe /internal
Duplicate- %windir%\System32\DisplaySwitch.exe /clone
Extend- %windir%\System32\DisplaySwitch.exe /extend
Second screen only- %windir%\System32\DisplaySwitch.exe /external