How to prevent IntelliJ IDEA / PHPStorm from marking a folder as a «source root»?

IntelliJ IDEA
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Step 1

Prevent the «Composer» submodule of PHPStorm from marking a folder as a «source root»

Step 2

How to quickly unmark all folders as «source roots» in IntelliJ IDEA / PHPStorm via the module (*.iml) file direct modification?

Step 3

How to unmark a folder as a «source root» via the IntelliJ IDEA / PHPStorm user interface?