Hello Simon, I just installed ps-top v1.1.15, and the z key is not working. I tried with v1.1.8, and it is working. It is not working in 1.1.9. It looks like the z was lost refactoring display/display.go: - https://github.com/sjmudd/ps-top/commit/dbf5ab65a3bd0413be3e83e0d0e467db064c5a9d#r173223546 Many thanks for looking into this, J-F