We have a group that needs to expand the size of a Private Channel site collection. Can't see the site collection from the Admin panel so looking for where this might be accomplished.

best response confirmed by melkinsco (Contributor)
Hi @melkinsco

See here:

By design, they aren't visible in the SharePoint admin centre. So, if you can do it, you would need to do so through Powershell. SharePoint Site Collection Limits apply

Best, Chris

Thanks @Christopher Hoard !  We  thought things were headed that way.  Very much appreciate the quick response!