I think it would be handy to be able to filter the software screens based on what is and is not installed. Tradition check box (or the like) to simply only show one or the other. Could also be used in conjunction with the existing category filters.
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Btw. do the category filters work for you? When I select anything except “No Filter” I always get an empty list…
Actually - now that you mention it - they do not. never noticed that before.
My apologies. Looks like the filters broke in the latest update. 
It’s been reported here:
https://bugs.launchpad.net/ubuntu/+source/ubuntu-mate-welcome/+bug/1590128
I’ll look into this ASAP.
Having installed / not installed filters sounds like a good idea. I’ll note this down, thanks! 