You can remove a participant(s) from an ongoing evaluation if, for instance, there is a typo in the participant's email or they are not meant to participate in the evaluation. Only participants who have a "Not started" status can be removed.
Go to the "Evaluations" tab and then click on the three little dots to find "Show details"
Click the "Edit" button at the top and then the menu icon on the participant to be removed.
If you are removing participants so the evaluation can close, you will still need to close the evaluation manually even if all other participants have completed their survey.