How to do random duos in fortnite?

I have now seen many YouTubers who always do duos and play randomly with someone, so not from the friend's list, but when I do duos and then play I'm alone against duos. Can you explain to me how I do it? (yes, I'm still playing ndnite) TwT

I think you have to change to replenish

This is already activated: /

So. Go to the selection of game modes. Where duos, teams etc. Are. Then you click on Duos and don't select it yet! Do it so that duos is on the right and choose below. Then there should be a button with the inscription "do not fill up" click on it, so that there's fill up. Then random people should come in

But keep in mind that not every random mate can speak or is German!

You go to duos then you can choose below whether it should be replenished or not

You have to go to duo and then fill up when you are alone

Go to Duos and then fill up

I need a answer