Login screen Mac reduced to the size of 1/4

The login screen of my 2013 13-inch MacBook Air is reduced to 1/4 of the size and the other 3/4 is black. IM OSX El Capitan 10.11.5. Thank you.

Try a reset of the NVRAM:

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

Ciao.

Tags: Mac OS & System Software

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