Hi Math,
To clarify, are you placing the Query Loop in a Default Archive page through a Block Element – Loop Template. Or, are you placing it on a static page?
For the GB Query Loop Block, you can add pagination through the toolbar. Example: https://share.getcloudapp.com/E0uZDO4E
This should generate pagination for the Loop.
Moreover, if you’re using a Loop Template, you may edit the Posts per page as you would normally in Settings > Reading > Blog pages show at most.