Another thing to note about the router screen Vs. mill screen.
Some of the supporting macros and output descriptions are only in the default router profile.
For example: one of the buttons on the router screen is for Dust Hood Up/Down (M114/M115). In the outputs list of the router profile you will find an output named M114/M115. In a mill profile that output is named Output #52. Also, the router profile has the m114 and m115 macros already so the output for the dust hood can be turned on and off from Gcode.
Not that any of this can't be done in a Mill profile, all of it certainly could be. But none of it will be in the default Mill profiles. To use them in a mill profile (or any profile for that matter) you would need to do some customizing. The default router profile (which uses the default router screen) includes tested and working examples.