The builder
Characters
Characters is where you tune how it feels to walk around your world. It is a panel of sliders for the player, not a brush.
What it controls
The panel carries six sliders: Walk speed, Run speed, Jump height, Field of view, Look pitch limit and Look sensitivity.
Walk speed, Run speed and Jump height are the movement. Field of view, Look pitch limit and Look sensitivity are the camera: how wide the view is, how far up and down you can look, and how fast the view turns.
Tune it by playing it
These are the settings most worth changing while actually moving. Movement that feels right in a screenshot often feels wrong at speed, and the only way to find out is to walk the world.
Press Play from the chat header to run the game as a player would see it, then come back to Arrange and adjust.
The panel is empty in a world that has no player. Add one first — that is one of the things Director 1 can do for you.