I just turned off less compiler in admin panel, cleared cache but still have less compiler working.
I don't want to use less in my project, how can I turn it totally off?
You can't turn off the the Less compiler.
You can only zurn of the compression of the compiled result.
If you don't want use Less you have to remove the references for loading less files in the index.php of your template.
This will result in an almost unstyled template.