Even when you are in the middle of a task, you can measure distances with the Measure Distance command. For example, consider the following workflow.
Use the Line command to draw a line (A).
On the Inspect tab, click the Measure Distance command and measure a distance (B).
Note:
You do not need to exit the Line command before measuring a distance.
To exit the Measure Distance command, right-click. The Line command is still active-you can pick up where you left off.
Continue using the Line command (C).