chaging apache’s default page and location

hi, i have a website, where i have installed mu on domain.tld/folder, and i have another application installed at domain.tld and because both domain.tld/index.php and domain.tld/folder/index.php use mod_rewrite and refer to index i dont want to have them both on the same folder (root folder).

The current solution i have is, domain.tld/index.html set with http redirect to domain.tld/folder, but that is bad.. in terms of SEO and stuff. Is there a way so that apache starts off my website at domain.tld/folder instead of domain.tld and have domain.tld still be accessable??