There is a new firmware update, 2.03, for the Z50 as of today, 3/2/21,
I received the notice via Email. It can be found on the Nikon USA website, under the "software" heading, under the "Firmware updates" sub-heading. They didn't fix the main issue with the re-touch menu, that being that several choices are missing, notably the monochrome option. These are present on my D3300 and D5600 and are also present on the Z5. I am aware that this can be altered before the shot is taken, but it can't be changed afterward.