"–" symbol in main window

In the main windows, a group is marked by a special symbol, “–”.

I cannot find it in the documentation: DEVONthink Pro Office 2.9.17 Documentation, page 142, makes no mention of it.

What does it mean?
Bildschirmfoto 2018-03-16 um 16.17.38.png

It’s the common symbol used for a mixed state. Often seen in checkboxes.
It means the contents have more than one state, like some items are flagged and some are not.

Oh. Now that you mention it :slight_smile: