The three logos you can change in manager_config and upload in ‘setttings/appearance’ are for favicon/manager header logo/manager header logo on mobile. For the login page itself, you currently have to change styling and logo in Keycloak, see Authentication logo - #17 by cheezymcsquibble But not sure whether you can add different logo’s for desktop and mobile. So far we always use the same logo and check resolution, which works out fine. Just half an answer 
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