Here ya go, edit the machine definition and right click on the axis and select properties

Should be mi4..... set it to 1

It wont let you put a dot in next to the SELECT POINTS button to enable it?

Once you've created the plane and saved it you dont need to go back to geometry and select it again to make it active, thru your view manager highlight the plane and click in the c column and t column next to it or use the icons to the middle right and select the tool plane and c plane icons, now that planes active again ready for working with