Font remove option greyed out in Font Book and also cannot remove from terminal

You can't.

Would you mind explaining why you "need" to remove fonts that ship with the system?

Lawrence0504 wrote:

I do not have this issue before upgrading to Catilina 10.15.2 release.

i explained this earlier.

Replacing system fonts in Catalina, if that is really necessary, is more difficult than in earlier versions of MacOS, as the system files are now "read only". To remove fonts from there you probably need to start up the machine from another volume/partition.

http://www.jklstudios.com/misc/osxfonts.html#sip

Lawrence0504 wrote:

I am trying to find out what is causing on showing incorrect display.

It may not be the fonts, but the way that text has been input/encoded. I would want to check this.

Replacing system fonts in Catalina, if that is really necessary, is more difficult than in earlier versions of MacOS, as the system files are now "read only". To remove fonts from there you probably need to start up the machine from another volume/partition.

http://www.jklstudios.com/misc/osxfonts.html#sip

Lawrence0504 wrote: The Language system fonts should be able to Disable now it was greyed out as below.

To ask Apple to add this feature sometime in the future, you need to go to

http://www.apple.com/feedback

In the meantime, there are two ways you can try to deactivate or remove the Unicode Myanmar system fonts:

1) Go back to MacOS Mojave, if your machine allows that.

2) Connect an external drive to your Mac and install another copy of MacOS on it. Boot your machine using the external drive, and the go into your main drive and remove the fonts you do not want.

Could you provide details about the problems with the new Myanmar fonts?

Have you tried installing the old ones in /library/fonts or home/library/fonts? (not system/library/fonts, which is protected in Catalina) ?

In the meantime, try something else, like Noto Sans Myanmar and let us know whether that does work right.

Could you please post screen shots of the correct and incorrect display? For the incorrect display, type the sequence in TextEdit or Pages. It would also be helpful if you could indicate the key sequence you are using for this test. This is so I can duplicate your experience on my machine, which is the first step in trouble shooting. (I do not know the Myanmar language itself but am familiar with how this script works and the font problems that can arise).

I will get back on other points later in the day.

Lawrence0504 wrote: As you may or may not aware, Myanmar font is under UniCode and previously, majority of Myanmar people are using the font system called "Zawgyi".  Since this is the transition time, we need to disable all other fonts while using single type of font.  Sounds crazy.

Could you clarify? It sounds like you are trying to disable Unicode fonts so the Mac will display Zawgyi correctly. Is that your purpose?

Lawrence0504 wrote: The problem details with new Myanmar fonts is cannot display Myanmar character correct format.  It was displayed as  မေသခင္သိေအာင္လုပ္ ဓမၼဘဏ္တိုက္ 

Here is a screen shot of what I see:

That looks like zawgyi encoding to me. If that is correct, no Apple or Noto font would ever display it correctly, regardless of the MacOS version. You would need to switch to the zawgyi font. But I thought everyone was moving to Unicode now, over the next two years, not the other way around.

PS It occurs to me that if you need to do a lot of work in Zawgyi, you might find it useful to install Windows on your Mac and do it on that platform. Apple really only supports Unicode and has been making it increasingly harder to handle non-standard encodings.