
You’ll notice that your dots have disappeared. That is because
we want to select our cube’s edges now. Click on at least one
edge in the Perspective viewport and move it around a bit.
Now try to rotate it and scale it a bit.
.
Note:
If you want to see the edges of any object in your
viewport, press the F4 key. Or you can right-click on the
viewport name and it will give you the option of turning
on edges. This will show a wireframe over your object,
which can be very, very helpful.
Return to the Modify panel and select the Border button, or
press the number 3 on your keyboard.
Border is simply a very fast way to select an “open” set of
edges. An open edge ...