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From Elxis Official Documentation

Elxis SEO PRO is a URL rewrite mechanism that generates search engines friendly URLs. ALL Elxis 2008.0+ sites should enable this mechanism! There are many reasons for this. Better ranking in search engines, human understandable site/URLs structure, clean URLs, better Elxis CMS internal functionality, etc. SEO PRO URLs are now the natural URLs for Elxis CMS. The whole CMS is optimized for SEO PRO. SEO PRO is the future. Instructions to enable SEO PRO (Apache web server)

Inside the Elxis root folder you will find a file called htaccess.txt. Open this file with a text editor such as notepad, pspad, editpad, etc. Find this line:

# RewriteBase /YourElxisDirectory/

Remove the comment # and replace the "/YourElxisDirectory/" with the relative path to your Elxis installation. In most cases this will be just a slash "/". So, that line will become:

RewriteBase /

If your site is located in a sub-directory you should use something like this:

RewriteBase /mysite/

Inside that file you will also find some other options. Read the comments and enable that features if you wish (optional). Save this file as .htaccess.

Go to Elxis administration and in Global Configuration and navigate to the tab "SEO". Select SEO PRO as the preferred method of generating the SEO URLs. Done!