Great news - Happy New Year!
Sometimes you have to see those lock messages as your “Escape badge”! However I wonder if what you see is standard for new Samsungs, that sounds more than I see. Did you go through Pre-install instructions as mentioned by @unicorn above? Install LineageOS on beyond1lte | LineageOS Wiki
One comment there is on the default launcher or Home app, Bliss. If you don’t get used to it, you might check out Lawnchair. You might have to use Aurora store in order to get the current version 2. For QR scanning I use Binary Eye.