If you add a separator in the Tag Panel between existing fields, it looks like this in the Mp3tag options for the Tag Panel:
If you click on a Separator and move it up or down with the small arrow up and arrow down Buttons, the word "Separator" disappears, leaving only an empty space:

After opening the same options again, the text "Separator" is visible again. Everything correct.
Version: Mp3tag v3.36-beta.2
OS: Windows 11
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I can confirm the visual bug reported by @LyricsLover, which affects the Separator tag (_SEPARATOR) in the Tag Panel section.
This issue has been present in earlier versions of Mp3tag. I've tested the following versions, which have the same problem:
Mp3tag V3.35
Mp3tag V3.34
Mp3tag V3.33
Tests with Windows 7 & 10
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I just did a test with my Windows XP, using version V3.05 of Mp3tag (2021-01-28), and the problem also existed in this version...