Rewriterule - rewrite url AND send it to a certain file
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I have searched around but can't find the answer to this relatively simple question; how to rewrite a url AND send it to a certain file.

This is my (modified) .htaccess

    RewriteEngine On
    RewriteRule ^xyz/([A-Za-z0-9\ -]+)$ index.php?xyz=$1 [L]

This shows mydomain.com/xyz/whatever while triggering the file index.php?xyz=whatever

I want it to instead show mydomain.com or maybe mydomain.com/someotherfolder

How do I do it? Thanks in advance.