Kindly note that the ‘Undo’ button can only be used while a measurement is being made (before the double click), if the measurement has been completed (after the double click) you will not be able to click the ‘undo’ button.
Instead to change a completed measurement you can:Option 1: Click on the ‘delete’ icon and re-measureOption 2: Click on the ‘edit’ icon and edit the measurement
Kindly note that the ‘Undo’ button can only be used while a measurement is being made (before the double click), if the measurement has been completed (after the double click) you will not be able to click the ‘undo’ button.