How to Turn On Experimental Features on a Bedrock Server

Experimental features are set per world, not in server.properties. The easiest way is to make the world in your own game with them turned on, then upload it.

Option 1: create the world in game (easiest)

1. In Minecraft on Windows or a phone, click Create New World.
2. Under Experiments, turn on the toggles you want.
3. Create the world and load it once, then exit.
4. Export it: Edit the world → Export World. This gives you a .mcworld file.
5. Upload it to your server: see How to Upload a World to a Bedrock Server.

Option 2: edit the world on the server

1. In Console, click Stop, then create a backup in Backups.
2. In Files, open worlds/<your world>/level.dat. It opens in the NBT editor.
3. Search for experiments, and set the toggles you want to 1.
4. Save and start the server.

Behaviour packs that need experiments (for example ones using Beta APIs) usually say which toggle they need.