How do I change drives in Mac startup manager to display “Macintosh HD” instead of “EFI Boot”?

[cheeseisgreater]

Not sure if this is the right section but...

I have a Mac Pro 3,1 running Catalina (patched by dosdude1's installer to work on my unsupported Mac). Initially, I was having problems with my GPU which led me to install OpenCore as per the suggestion of a forum user. I ended up solving my GPU problem without OpenCore so I formatted my partition (to APFS) and installed Catalina normally.

Currently I have Windows installed on another partition. My drives are as follows:

Physical disk 1: Macintosh HD (Contains OS) Windows HD (Contains OS)

Physical disk 2: Windows HD 2 (No OS, for extra storage)

Physical disk 3: Macintosh HD 2 (for extra storage, formatted APFS) Windows HD 3 (for extra storage)

When I boot my Mac holding the Option key, I see:

"Windows" "EFI Boot" "EFI Boot"

Windows boots up Windows 10. Both EFI boot options boot up Catalina and I have no idea why they display this way.

In Startup Disk on Catalina, I see "Mac OS" and "Windows HD", which is exactly what I would expect my boot loader to look like.

In Startup Disk on Windows 10, I see "Windows HD", "Basic data partition Windows" and another "Basic Partition Windows". If I click any of the latter two, it boots up in Catalina.

 

[Les Lariz]

Have you tried to do an NVRAM reset? That seemed to fix it for me once but I have since encountered the problem
again and NVRAM reset does nothing to fix it. Were you able to resolve this some other way? Let me know, please.

 

[Taz Mangus]

You would probably get more responses posting to this thread: https://forums.macrumors.com/threads/macos-10-15-catalina-on-unsupported-macs.2183772/