Domain and Aliases

[pollos]

Hi

I have just setup hosting using plesk for the first time and have made a mistake already.

I have example.co.uk setup as my site domain name and have example.com set up as an aliases. Is there an easy way of swapping them around so that example.com is the main domain name and example.co.uk is the aliases.

At the moment I'm using a rewrite rule in .htaccess but would rather not if possible.

Any help much appreciated, thank for your time.