IntelliJ: How to change background color of Project Folder window?

Go to:

Settings->Appearance & Behavior->File colors

On the right side there will be small '+' button. Add All, Project Files etc. Add your custom colour. Apply, Ok, Voila!

enter image description here

Project view background color depends on the theme selected and cannot be changed:

IDEA-132299 Allow custom colors for the built-in UI themes (LAFs Darcula and Default)

Certain folders and files will have different colors based on the Scopes.

scope color

In addition to what @CrazyCoder said.

You may use another GUI Theme. There are at least 2 plugins available that will provide different dark themes:

Since they provided via plugins you will have to disable such plugin if you wish to switch to another GUI Theme.

As for the Project View panel background:

That yellowish color can be changed/disabled as per @CrazyCoder's screenshot
Actual background color might be changed with the help of one of such plugins (sorry, I do not know if they still work -- but used to work in the past -- last update 4 years ago):
- Color Ide
- Color Tree

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