2018.3.4 Community Edition editor color scheme not working
I am using the 2018.3.4 community edition of IntelliJ and I've been trying to apply UI themes and editor color schemes.
When I try to customise specific language (Java) editor colors they simply do not apply. In the example shown below, the class names should be pink, but they remain in the default Darcula scheme. I have tried to apply the same change to all the values it originally inherit from, and I have tried to disable the inheriting, as shown in the picture. Nothing works.

I initially encountered this problem when installing the Material Theme UI plugin, where I discovered it didn't apply any color schemes in the editor. At first I thought it was a problem with the plugin, but now I have found that I cannot even do these changes in the default IntelliJ themes, so it must be a problem in IntelliJ, not the plugin.
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Try to remove IDE folders and start with all the defaults (https://intellij-support.jetbrains.com/hc/articles/206544519). Don't import any settings.
Create a copy of the default scheme and then try to modify it.
If the issue persists, please report a bug at https://youtrack.jetbrains.com/issues/IDEA and attach IDE logs (https://intellij-support.jetbrains.com/hc/articles/207241085).
I've tried Serge's proposed solution but it had no effect, so I've created an issue ticket at https://youtrack.jetbrains.com/issue/IDEA-207681
See https://stackoverflow.com/a/43319356/104891. Fix the source roots and the highlighting will start to work.
Ah, I didn't realise that was the problem. Thank you, that fixed it (opening the next project folder instead of the root folder).
Stensig04 please explain me what you did with detailed steps.
(answering from a different account)
@Sivamani123121
I don't remember exactly what I did, but from the sound of my reply, it seems that I had opened the wrong folder as the project folder. E.g. if the project was in ~/code/projects/my-project, I had opened the ~/code/projects directory as the project in Intellij, but I should've opened ~/code/projects/my-project instead.
I have the same problem with IntelliJ IDEA Community Edition 2021.1.2, I would ask you to give me detailed and precise instructions on how to solve this problem. Thank you for your help
Hello,
Please attach screenshot with your project tree showing full path to file with broken highlighting.
Sorry, I'm new to Intellij Idea and I didn't know I should turn off the option for unused symbol..., everything works great for now. Thanks for your attention, greeting.