At any point after creating a private pool, you can change the settings to suit your needs. To do so, select the 'Settings' tab, and you will see all the individual settings that can only be edited by a commissioner:

Whilst much of the settings are the same as those when creating a league, if you expand the 'Pool players' section, you are able to either grant commissioner privileges to a specific participant, or remove them from the league entirely - you will be asked to confirm both actions before they are processed:

Additionally, if the pool has run its course, it can be archived so it is no longer accessible. Please note, this cannot be undone: