I don't want Lightroom to start automatically every time I insert a thumb drive, thinking it is my camera. What am I missing that I need to change on setup?
Well you didn't say what OS you use so it is hard to give you instructions.
In Windows you need to adjust Autoplay
In Mac you need to adjust Image Capture
In Lightroom Preferences-
General Tab- Import Options- Remove the tick from "Show import dialog when a memory card is detected"
Thank you, it was Windows. It worked.