Hello! The cooperation between SolidWorks drip block and slide rail is that the slide rail is a fixed part, and when the slider is assembled on the slide rail, the two contact surfaces overlap respectively. At this point, you can drag the slider to move along the slide rail in a straight line.

Take the fixed surface on the slide rail and the corresponding surface on the slider, and add the distance fit in the advanced fit. Define the maximum distance and minimum distance. So that the slider can drag freely between these distances. Good luck!