Hide logo wp

Do you mean the logo of WP on the Admin Bar, top left?

If yes, please check the current development version, there have a option to hide the admin bar nodes.
https://www.ads-software.com/support/topic/new-version-released-tests-are-welcome

Hello
no, I mean the logo of the login at https://www.mywebsite.com/wp-login
then log in with a username and password that all users of all levels see

Ah, this is no option of the plugin.

Maybe my small class helps you – https://github.com/bueltge/wordpress-basis-theme/tree/namespace/inc/admin