Short answer: Financials access can be taken back on its own by a founder. For the other sections there's no way to strip access to just one, so you remove the person from the organisation and re-invite them if they still need others.
Taking back Financials
Financials is the one section with a clean revoke. A founder can take that access back from Settings, then Team, without removing the person from your firm or touching anything else they hold.
Only a founder can do this, in the same way that only a founder could share it in the first place.
Note: Taking back Financials also takes back the ability to connect Xero that came with it.
Removing access to the other sections
Once a teammate has finished the section (or sections) you handed them, you might want to take their access back. For the seven ordinary sections, the portal doesn't offer an "un-share this one section" action. Sharing a section grants view and write access together, and there's no separate control that revokes it while leaving the person otherwise in place.
The confirmed way to remove a specific person's access is to remove them from the organisation entirely, from your organisation's member management area (outside the onboarding portal itself). The owner, a co-founder or an admin can do this.
Open your organisation's member management area.
Find the teammate's row.
Remove them from the organisation.
Removing someone this way takes back everything they could see and edit, not just the section you originally handed them. If they still need access to other sections, invite them again afterwards. See Inviting your team to help for how to send a fresh invite.
Warning: For the ordinary sections, removing a teammate is all-or-nothing. It isn't possible to leave them in the organisation while quietly taking back just one of those sections.
Note: Re-sending an invite that covers a different set of sections to someone who's already active can overwrite the sections they were previously granted. Check what you're handing over each time you re-invite.
Tip: The "assigned to" label on a section's dashboard row is only a temporary, on-screen detail. It doesn't reflect who actually still has access, so don't rely on it to work out whose access needs removing; check your organisation's member management area instead.
Any progress your teammate already saved stays in place after you remove them. Removing access only changes who can see and edit the section going forward, not the work that's already been recorded.