How to turn off highlights of class, method names
已回答
How can I turn off the highlights on
- import statements
- class names
- method names (signature and calls)
- things such as `@Test`
?

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Looks like these are the inspection warnings from various inspections that are enabled. Please put cursor on the highlighted symbol and from Alt+Enter popup menu select the inspection which reports the warning and disable it:
See Suppressing inspections in the editor.
In the case of the method name in its signature, disabling all inspections did not remove the highlights.
If it is not an inspection highlighting, to find the corresponding color settings you can use Jump to Colors and Fonts action (Help | Find Action...) with the caret placed on the symbol:
to go to relevant colors settings: