This sounds interesting, I popped the key cap off that button and also the print-screen button since I was amassing a sizable collection of accidental desktop screenshots!

Edit: It's not in the K2 manual but there is a shortcut, FN + L + lightbulb key that works to lock it -

https://www.keychron.com/pages/k2-user-manual

https://keychronsupport.zendesk.com/hc/en-us/articles/360052...