Counter for new mail in subfolder not showing

I use emClient on Mac and Windows and on my Mac I see the red +n counter next to subfolders, when there is a new mail in this folder. Mails get moved into these folders on the server side with some rule set.

On Windows, these little counters only show up, if I actively open the folder, which is kinda annoying. I tried to find if there is any option to turn this on, but didn’t find any.

What am I missing? Any help is highly appreciated.

Cheers, Harry.