The active thot within an editor is the thot that the cursor has been placed into. To deactivate the active thot, press "Done" at the top right of the editor. Alternatively, you can move the cursor into a separate thot making it the new active thot.
When
A user can "focus" a thot by making it the active thot by placing the cursor into it:
"Focus the header thot in order to be able to frame it."