Please make sure to take a look at the Essential Game Hints guide and the Quick Reference in the vorpX help. vorpX provides several functions that deal with the field of view and other display related things.
What you are probably looking for is the EdgePeek function (default: middle mouse button) that allows you look around the screen.
Some games also allow you to adjust the HUD size and depth on the display page of the vorpX ingame menu.
Adjusting the FOV is also VERY important for a pleasent experience. The Essential Game Hints guide lists the various options you have in this regard.