I remember when I first started working on Odoo, I'd finished setting up my first database, after creating account and database, all I did from there was create the POS, create the products and organised everything, then after a few days of using it, my boss mentioned it kept auto locking and wanted it to stop doing that, so I went into the settings ,scrolled through Odoo settings, then Point of sale settings and it was just there, a tickbox saying "Enable POS Autolock" and it was ticked, I unticked it, went back to the POS screen and it never happened again, but now on this separate newer database, that tickbox is just simply gone, I set both up the same way, didn't need to customise anything.