Right to Left (RTL) version CSS files are included within the theme. To change it, find the "RTL Version" CSS link in the source code files.
Run assets compiler with --rtl flag in [keen]/theme/tools folder to generate the RTL version of CSS files.
gulp --rtl
Also can be enabled via config in [keen]/theme/[demo]/tools/gulp.config.json and run the Gulp compiler to update the assets.
Comment out the normal Left to Right (LTR) CSS files and enable the RTL files which has suffix name *.rtl.css. For example:
<link href="assets/css/demo1/style.bundle.rtl.css" rel="stylesheet" type="text/css" />
Add the direction attribute to the root HTML tag:
<html direction="rtl" dir="rtl" style="direction: rtl" >