(All) checkbox always visible in column filter box

Hi DBVis team,

when applying a column filter on a large list it would be helpful to always have the (All) checkbox always visible. For example, when I scroll down to find a serial number and only want this number to be checked but forgot to uncheck all others first, then I would have to go all the way up again, uncheck all and then scroll down again.

TLDR; It would be nice to check/uncheck all items no matter where in the list I am scrolled to. I shopped the picture below to show you what I mean.