How do I turn Fortnite crossplay On or Off from my console?

If you would like to turn on/off crossplay on your console, you can follow the steps below.

In the Fortnite lobby on Playstation:

1. Go to the Menu by pressing Start and scrolling down to the gear icon.
2. Click on Settings.
3. In Settings, go to the Account And Privacy tab.
4. Scroll down to Gameplay Privacy to find Allow Cross Platform Play.
5. Set to Yes to turn crossplay on or No to turn it off.

on Xbox: refer to https://support.xbox.com/en-US/help/hardware-network/connect-network/multiplayer-cross-network-play