You can move a plumbing component in the current XY plane using a location grip. Location grips appear on parts at their insertion points and connector points.
Location grips on a plumbing line segment
If the plumbing line segment is not connected to another object, you can change both its length and angle using the Start grip or End grip.
The Start and End grips enable you to change the XY location of the start point or end point of the segment. This is useful when you are initially designing runs because you can easily connect a segment to an existing run.
If the part or plumbing line segment is connected to other objects, you must specify whether you want to maintain their connectivity when you move the part.