How to Set Cycles Viewport Render to Grayscale

I have checked every character. I did it in notepad. Maybe I need some kind of specialized software? Nothing works for me, I just don’t see the profile I need in the color management settings in Blender. I already spent 2 hours or more on this problem, I have Blender v2.93, although in 2.91 everything worked out without any problems. Could you share the file or tell me where the extra space is?