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

IntelliJ IDEA
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Step 1

Close the project in IntelliJ IDEA.

Step 2

Open the project module file (*.iml).

Step 3

Delete all XML subtags inside the <content> tag:

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2023-12-05--02-40-501444×876 56.8 KB

Step 4

Re-open the project in IntelliJ IDEA.
Some IntelliJ / PHPStorm plugins are still keep re-marking some folders as «source roots».
In this case, unmark these folders using the UI.
The UI way is slower, but it prevents all plugins from re-marking folders as «source roots».
I do not know why is it happen because the UI way does not make any extra changes in the project files beyond the described in the Step 3 above.

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