How can I set Fortnite to start a new round directly?

Fr
1

I once created my own box fight at my Fortnite so that I can play with my friends on my island, but whenever I play, for example we're 2 and I kill him, he changes to observer and no new round is started

How can I set that the next round starts automatically when I win?

Fe

So when the round is over you just go to the menu where you can also leave creative and then start at the bottom.