Mac pop up notifications getting cut off on the right Recently all of my pop up notifications are getting cut off so I can only see half of it, like the computer thinks my screen is wider than it is, as you can see in the picture:



I have a 2019 15 inch MacBook Pro, with Mojave 10.14.6.
I also have a monitor attached which is a LEN P27u-10 Display but this issue still persists even if I detach the monitor.
From comments… based on nothing but guesswork, try the old "switch it off then on again" with a slight twist.

Try changing monitor resolution temporarily, maybe also reboot after you change it. Leave the external disconnected whilst testing.