I used to be able to display the virtual horizon from live view in my Nikon D7500. After a few weeks I tried to use it again but now the option is disabled in the setup menu. It also will not show up if I repeatedly click the info button while in Live View. I think it has something to do with the way my info button is displaying options in my Live View because I thought different options were suppose to be cycled through when repeatedly clicking the info button but now that does not happen either. I think I must of changed a setting somewhere that has caused this but I have not been able to figure out how to fix this.
Turns out I miss took the "I" button on the right side of the back as the information button when there was literally a button labeled "Info" on the left side of the back. I was pressing the "I" button when I should have been pressing the "Info" button. Pressing the "Info" button brings up the horizon graphic to level the camera.
This solves the problem of getting the horizon graphic to show for insuring the camera is level. The horizon option in the menu system is still disabled but I don't need that as long as I can pull it up using the "Info" button on the left rear of the camera.