Settings - Tabs and Indents

please can you elaborate on this? Do you mean that you get different indent size when reformatting your HTML code?

Any value I put does not match. Nothing happens.

I put the indentation as 4:

But I have my code in the indentation with 2:

Thanks!

do you have .editorconfig file in your project? Try disabling editorconfig support in Settings | Editor | Code Style by unchecking Enable Editorconfig support checkbox - does it make any difference?

Yes, perfect!
Just disable the Support Configuration Editor checkbox.

Thank you!