Minecraft Bedrock server settings without server.properties

Type op in the server's console in HaruHost, in the app or the web panel.

Game

Game Mode (Survival, Creative, Adventure), Difficulty (Peaceful to Hard) and Allow Cheats.
Default Player Permission Level: Visitor, Member or Operator for new players.

Level Name and Level Seed. A new name creates a new world.
View Distance, 32 chunks by default, and Tick Distance, 4. Lower them if the server lags.

Server Name and Max Players, 10 by default.
Allow List and Online Mode: with the allow list on, add players with allowlist add <name> in HaruHost's console.
Player Idle Timeout: minutes before an idle player is kicked, 30 by default.

How do I make someone an operator on Bedrock?

Type op <name> in the server's console in HaruHost, in the app or the web panel.

How do I turn on cheats?

Turn on Allow Cheats on the Auto Config page and restart the server.