I’m wondering if it might be a good idea to take a click on the “Blur Cell” arrow to also mean “Unpin cell” for a cell that is pinned.
It’s kind of annoying to have to mouse over all the way to the right to unpin every new cell. I do know that there’s a keyvboard shortcut, but I don’t have that in memory yet. 
In any case, though, I can’t see any other way that a click on the “Blur Cell” arrow could be interpreted, actually. Right now nothing happens.
