Fortnite res change is net?

I want to change my fortnite resolution.

I've already changed the res, but in the game it's still the same as before.

I'm assuming that you play on the PC.

For many games, you have to restart the game so that something like this is taken over

I'm sorry. I was in a hurry and therefore could not give more specific information, but yes you are right I'm playing on the PC and I will try it.