I've used LR for many years but have never figured out the following: When I work on a batch of photos in Develop, most of the time the Develop settings are on their normal defaults (e.g., 0 for most sliders; blank for lens, etc.) As I process each photo and move to the next, the settings jump back to default. Sometimes, however, this second step doesn't occur; when I open the second photo the Develop settings remain where I left them in processing the first photo. Recently, LR sometimes opens with the settings I used in the last session, even though I have closed LR in the interim.
I know how to use Copy and Paste but they don't seem to be involved. I don't know how to use Sync; I've watched a couple of tutorials but they assume a knowledge of Sync which I don't have.
Any help appreciated.