There are two modes for sketching in 2D: click-drag or click-click.
SolidWorks responds to your cues to determine the mode as follows:
If you click the first point and drag,
you are in click-drag mode.
If you click the first point and release
the pointer, you are in click-click mode.
When you sketch entities in click-click mode and end a line
or arc on the endpoint of an existing sketch entity, the tool stays active
but does not show a preview from the last location.
When the Line and Arc
tools are in click-click mode, they create a chain of segments as you
click. To terminate a sketch chain, do one of the following:
Double-click to terminate the chain of entities
and leave the tool active.
Right-click and select End
chain, which is the same as double-clicking.
to terminate the chain and release the tool.
Move the pointer outside the view window to stop
dragging. You can then choose another tool, which also terminates the