Screen turned 180 degrees, doesn't turn back

Try some basics:

Turn off the MBP and reset the SMC and NVRAM:

https://support.apple.com/en-us/HT201295

https://support.apple.com/en-us/HT204063

Ciao.

Quit everything, including System Preferences.

Hold down Option+Command while you open System Preferences and keep the keys held until you open System Preferences > Displays > Display.

Look in System Preferences > Displays > Display for a "Rotation" drop down menu. Change it back to normal

Before reinstalling, you may just need to reset your preferences. If it can't load the Display Preference Pane, there could be something wrong with your System Preferences.plist. Note that deleting this plist will RESET ALL of your preferences in System Preferences.

Click Finder, then click Go > Go to folder. Type in the following

~/Library/Preferences/

Click Go, then look for com.apple.systempreferences.plist and drag it to the trash. Don't empty the trash yet.

Restart the computer and open System Preferences the same way I told you before and see if it loads the Displays preference pane this time. If it still doesn't work, you might as well open the trash, right click the original plist and click "Put Back." If it says the file already exists, replace it with your original. This will at least bring your other settings back.

IF all this fails, then try a reinstall.

Is this a window in Preview or the entire display? If Preview, try Preview>Tools.

Ciao.

This is new to me. Try a restart.

Ciao.

Try the SMC and NVRAM as OGELTHORPE recommended and see if that helps.

Do you have any other displays or peripherals connected?

Appleuser

I accidentally turned my screen 180 degrees. It doesn't get back to normal. What to do?😢

How?

If nothing has worked so far, consider reinstalling the OSX. If still no success, an Apple store genius bar appointment is your best option. The evaluation will be FREE.

Ciao.

Any changes?