How to remove Startup Disk from About This Mac?

I've been wondering how this happens because when I usually open the About This Mac feature to check the information, it doesn't display the main drive/startup disk (Macintosh HD) most times although when I use disk utility to view it and make a change then it appears on the information. I am very confused about this because it goes back and forth between displaying the startup disk on About This Mac to not displaying it at all, which makes me think something is triggering it, like a switch.

I was wondering if there is any reason how this happens because I haven't really seen anyone talk about this from my browsing, and also if there was an option to remove it and be able to add it back in again, because even I prefer not seeing the startup disk information on the features although I don't mind seeing it there as well, and I would like to have an answer since this got me very curious, many thanks.