What does it mean when a directory is red in IntelliJ WebStorm?

Question

So I pressed something by mistake (was in a flyout menu so not sure what it was) and now one of my folders is red.

This is what a regular directory looks like:

Answer 1

It means Excluded Root and is explained in IntelliJ IDEA Docs as:

Excluded roots are ones that IntelliJ IDEA "partially ignores".

Very limited coding assistance is provided for files in excluded folders. Classes contained in excluded folders don't appear in code completion suggestion lists, references to such classes are shown in the editor as unresolved. When searching, IntelliJ IDEA doesn't look in excluded folders, etc.

Here is a complete list of IntelliJ symbols and icons for future reference.

You can cancel the exclusion by right clicking the directory in project view and selecting Mark Directory As/Cancel Exclusion.