I keep forgetting how to do this, so I’m posting this for my future self as well as other readers.
To adjust the depth of either the
Focus Heading or the
Move To Heading command, activate it and click on the gear in the top right.
Then, in the
Outline Path field, adjust the numerical value in the
@level <= 3/ancestor-or-self::* expression.
In this example, it’s set to
3. This yields three levels of headings when using the command.