I am having issues changing a viewport that was added, I cannot select it to delete or resize it.  Is there a way that the viewport could be locked from editing other than the lock icon next to the viewport scale?  Is there a way to manually type in the scale without zooming in and out manually to adjust the viewport.  Thank you for the help.

If the viewport is on the Defpoints layer, and layer 0 is frozen or off, the viewport will be unselectable.