I am using Dymola 2021 and 2021X, the underscore doesn't show in any models. I tried to reinstall Dymola and adjust the setting option of the text editor, but the problem still exists.
My questions are:
Is this some kind of bug in the new version?
If not a bug, how to fix this issue?

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It's the Linux version of Dymola, correct? – Markus A. Jan 19 '21 at 07:04
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@MarkusA. Windows – Jack Jan 19 '21 at 07:05
2 Answers
You can start Dymola with a different font as follows (as described in the full manual on page 495, "Developing a model|Tools>options|General group settings|Base font size")
"C:\Program Files\Dymola 2021x\bin\Dymola.exe" –fixedfont
"Lucida Console"
or some other font than "Lucida Console" - I hope you have some that works; there's also plain -font
for the non-fixed width font.
As far as I see this setting isn't stored anywhere so you will have to make a short-cut to Dymola and use that every time.

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By using the following command `.\Dymola.exe -fixedfont "Lucida Console" `, the underscore shows now, but I guess I might change the default font of Windows OS. – Jack Jan 19 '21 at 10:47
I have never seen this behavior before and it works just fine for all installations I have seen. It seems you have changed some fonts, maybe on operating system level, could you change these back? Default is sans-serif for menus (see screenshot), you use a font with serifs.
Also, a line length of 50 is very questionable, the default 80 is a reasonable MINIMUM.
Can you try and reset all Dymola settings, like this:

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Indeed, I installed Mactype to change the fonts of Windows system, but the problem still exists after I uninstall Mactype. – Jack Jan 19 '21 at 07:07
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1Do you see the same problem in other tools on the same computer? What happens if you copy text from Dymola and paste it into Notepad or Word? – Priyanka Jan 19 '21 at 07:30
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Didn't meet this problem on other machines. When paste the text from Dymola to other software, the underscore shows normally. – Jack Jan 19 '21 at 09:06