I am trying to set up Draftsight and have difficulty getting the image within scale. If I set the units to mm in and Drawing Settings (although it says this is for Blocks) and draw a 100mm line it disappears off the screen. I can use zoom to display the whole line but if I dimension it the text is so small it cannot be read. How can I draw in mm an object say 100 x 300mm with readable dimensions? Is there a setting I have missed?