When you invite someone to give feedback in Talos Perform, they're sent an email immediately. So the nominee will have received an email and may have begun completing the feedback already.
Uninviting someone will prevent them from giving feedback and changing any feedback they've given already.
Any feedback already provided by the nominee will not be deleted – even if you uninvite them.
To uninvite someone
Search for the reviewee. Navigate to their Reviews tab. Beneath each review in progress is a Request feedback button which will allow you to uninvite colleagues to provide their feedback.
Click on Request feedback to see the nominations that have been sent. Next to the ones that are still pending, you will see a x icon to delete.
The nominee will no longer see the invitation to give feedback on their dashboard on Talos Perform.
Once uninvited, you can reinvite someone using the usual invitation process.