"Show more" "Show less" in River

In the River, what does it mean to “Show less of” a source? I can see that “Show more” means to filter the river only show that specific source. Does “Show less” take it out of the river permanently or temporarily? Is there a way to undo this action as with the “Show more” action?

It seems like it hides the specific source for seven days, and can be disabled in Source Actions (where the pinned settings are)

Correct, sorry! Been head down working through bugs and I didn’t see this when I did my rounds.