How do I remove staff?

Go to Manage, then People. Tick the people who've left and press Remove. Or open one person's page and press Remove there.

If you have a list of leavers, "Remove from a list of emails" lets you paste in their addresses and remove them all at once.

People you remove lose access to your school's courses straight away. They keep their certificates, and your school keeps its record of the training they did while they worked for you.

You need the "Manage everything" role to remove people.