Override this view:

\views\default\page\elements\topbar.php

By deleting:

<?= elgg_view('core/account/login_dropdown') ?>

How are you trying to do it?

Code snippet please.

BTW, there's a plugin for redirects on your site

You can try how it works between our apps:

Sign in PostWall then connect to eStore (you can delete accounts both after testing)

Hi Nikolai,

thanks for your reply,

my app already does authenticaiton, but it's basic database authentication.

I want elgg to generate a session without further authentication, trusting that i already have authenticated the user. is there a way to generate a session in the database or something of that sort?

The mentioned plugins do it. At least https://github.com/arckinteractive/elgg3_oauth_sso