Error when use system sass compiler

[artem-totality]

Koala version 2.3.0 for Linux MX 64

When I use koala by default with SCSS it doesn`t complile properly such case:

$gap: 12px; width: calc(50% - $gap);
to
width: calc(50% - 12px);

I installed npm install -g sass. Then I try in command line for example sass style.scss style.css, and all work perfectly!

Then i go to the Settings>Sass>Advanced Settings>Use the system sass compiler, and enter sass.
After that i have error
/home/user/dev/my.scss
/bin/sh: 1: sass: not found

If i enter here ful path /home/totality/.nvm/versions/node/v20.5.0/bin/sass
Then I see error /home/user/dev/my.scss with only pass to my scss file.

Why does it happen, and how I can use system compiler?

[doc-souhail]

Koala app not supported anymore, we have same problemes with Bootstrap v5, try other compiler like Dart sass