In New Vegas you could use the F1,F2, and F3 keys to toggle the three tabs in the pip boy, and toggling it again while in that tab closes the pip boy. This is missing in Fallout 4. Instead they added new controls to navigate the tabs by using the "W" and "S" buttons which I do not like. When you are walking and holding the W button down, and then open the pip boy, releasing W causes the tab to change. Dumb. Would love to see both of these issues fixed