So, I thought I was being smart, clearly failed again. 🙂
To save screen "real-estate" I thought it would be good to have a number of filters brought forward through a window. The screengrab below shows the result is correct as I apply a filter from the window, I've included the count which I used to verify it was working, however, as soon the window is deactivated (clicked off) it clears the filter.
Is there a setting, or something I'm missing to keep the filter(s) active after closing the window?