Hello Sui,

I'm not sure you can "turn off" less, but if you are more comfortable with styling using CSS, you can add a custom CSS file that will override any styles defined using the core LESS files.

To add your own custom CSS take a look here.

I've used this method to make changes including dimensions of my logo image as well as link colors.

Hi Sui,

If you are sure you won't use LESS for that website, just switch it off in Template Manager.
In that case, instead of editing the .less files located in /templates/your_template_name/less directory, you can just directly edit all .css files located in /templates/your_template_name/css directory

But beware : if later on you feel like playing with LESS... and if you click on the "compile LESS to CSS" button, all your customized css files will be overwritten by new ones derived from the LESS files.

Yours,

Marc

PS :
LESS is very intuitive. Advantage is for example you can define a color in a variable like @my_official_color... and even if this color appears in 100 places, you just have to edit it in one place...
Even better, LESS allows to use functions, like darken or lighten a color by x%. So it makes your work faster because you don't have to manually compute those things.