Heimdall - how to setup /userselect as the landing page

I have searched and searched and cannot find any information on how to make /userselect the landing page instead of index.php for example.

I have tried the full URL in the redirect statement in nginx (https://heimdall.example.com/userselect) but the page it displays doesn’t look right.
Because of the cookie error (see https://github.com/linuxserver/Heimdall/issues/379) will be good to redirect to /userselect as this doesn’t show any cookie errors and users can just login.

Will appreciate any help with this.