Sometimes a 2nd data point is placed.When using Place line or move element, after selecting an element or starting the line, the task will end and the element will be placed shortly after selecting it.
Disable Drag Operations.When Drag operations are enabled, it is possible to not lift the mouse button just after selecting the element or placing the line. This will happen if the mouse button is held down too long (longer than a click).1. From the Menubar, go to Workspace > Preferences (Preferences dialog opens)2. Go to Category "Input".3. Check on "Disable drag Operations".4. Click OK.