Let's take a look at the Back button.
To exit the Measure Tool, it is recommended to select the Back button. Upon selecting the Back button, if you have any unsaved work, a pop-up will appear offering the following options;
Stay On This Page β By selecting this option, you can cancel leaving the Measure Tool and remain on the current page to continue your work. This is useful if you want to review or make further adjustments to your measurements.
Leave Without Saving β Choosing this option will exit the Measure Tool and discard any unsaved changes. Use this option when you no longer need to save your measurements or if you want to start over with a clean slate.
Save And Leave β Selecting this option will save your work and exit you out of the Measure Tool. This is the preferred choice when you have completed your measurements and want to ensure your progress is saved.