Sometime you have to press fn to make it work.
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Settings for MC.
If you are using mac, and the f5 key does not work, it is because you are not holding down the fn key. The fn key should be on the bottom left side of your keyboard. Hold down the fn key while pressing f5 and it should work. Hope this helps!
press F5
mac: command and F5 pc: control and F5
It doesn't work on all computers. Try changing the key.