Settle3D > Viewing and Display Options
The Ruler appears at the left and bottom edge of the Plan View.
The Ruler options in the View menu allow you to toggle the display of the Ruler ON or OFF, and to customize the spacing of the measurements on the ruler.
NOTE:
A shortcut to quickly hide the Ruler, is to right-click anywhere on the Ruler, and select Hide Ruler from the popup menu. To display the Ruler again, you will have to select the Ruler option in the View menu, or the Show Ruler checkbox in the Display Options dialog.
Axes can be added anywhere on a view with the Axes option in the Tools menu.