2020.3.20 editor UI change back to old style and dont know what happen

dont know what exactly change the editor theme back to the old style , any help?

settings?
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I guess what the OP meant was the visibility of color gradients. As we all know, the Editor uses flat colors everywhere nowadays.

What did you do when the change happened? Do you think it could be related to a third-party asset that you’re using?

i think so ,but just dont really recall what exactly did this wrong. i tried to create a new project with the same version of the editor, it works fine, the UI element is all flat instead of just old styling

i tried changing the theme and fonts, still didnt work.i tried to create a new project with the same version of the editor, it works fine, the UI element is all flat instead of just old styling

You can’t really change that, only the light or dark and some colors. If you want to use the 3d gradient style you will need to use that Unity version.

You could try…

  • closing Unity, deleting the Library folder that’s inside your Project folder (be sure to make a backup of your Project first, should something go wrong) and open the Editor again. Did that fixed it?
  • removing each third-party asset one at a time and see if the issue vanishes.
  • (again, be sure to make a backup of your Project first, in case something goes wrong)*