Site admin access to all Orgs

We have 2 site admin’s in our Github on premise and I am one of them. All org’s were initially created by other site admin and now the responsibility is transferred to me to manage all orgs and repo’s.

Now the problem I have is that I can’t see all repo’s of each org even I am a site admin. Do other site admin need to manually assign me as an owner of each repo to get access? Is there a a setting available to site admin get access to all repo’s?