no worries found it. You have to create a part, then scroll to the right as the comment bar isn’t on the screen and is hidden… Steinberg, seriously? You can’t just have a standalone sysex editor which you can freely jump to from the midi section?
did the same as you refer but not opening for me, 2022 cubase 11 such a cool features but not dedicated sysex editor . in general they have reconsider redesign the midi editing
environment