Anything you select will stay static during snapping, so you want to select both nodes and the piece of track that you want to move, then it'll bend the next spline in the chain connected to the road (if there is one) or you can select both nodes and multiple track pieces on one side, then all those track pieces will stay static (won't bend, will be moved instead).

The node you select first is the side that will be bent, so take two roads as an example, A and B: If you select node A and then node B and hit Enter, track piece A will bend to snap into node B. However, if you want track A to stay static, select node A and then node B and then track piece A, then hit Enter. That will move track piece A to snap with node B instead of bending A. If you want instead track B to move, make sure you select node B first and then node A and track B before hitting Enter.

Also, I'd recommend joining the Discord server, where we have an #editor channel for quick help on stuff like this: https://discord.gg/distance