My Photoshop desktop histogram has turned gray and I can't get the color back.

I am working with Photoshop desktop version 27.4.0 on a Windows 11 computer. I was watching a class on channels that said to turn off the Show Channels in Color in the Preferences/Interface. When I opened the histogram panel per their instructions, it was gray. I have not had it open for a while to the preferences setting may have been a coincidence.
 

The Image mode is RGB, the Channels in the histogram panel is set to RGB. I have reset the histogram panel. I have toggled through all of the hamburger flyout view options in the histogram panel. Show channels in color is checked in that same hamburger menu. I have tried toggling that Show Channels in Color on and off. The computer is using the GPU and it indicates the correct graphics card. The histogram is gray when I open another image or when I create a new one and paint. I have double clicked within the panel to reset it. I made sure that both Windows and the graphics drivers are up to date. Every time I have rebooted Photoshop, the histogram panel opens in the Color channel, and switching back to RGB is still gray.
 

Any other suggestions would be greatly appreciated. I really would rather not reset my preferences or reinstall Photoshop unless I really have to.

Thank you, 

Marcy