It took me a long time 2 get here - question of Apple ID n pw. This solved part of my question and helped me. Neat. Being a neuby at this, I'm now wondering how i got an answer so quickly? Panic didn't allow me to think of doing that. It even took me a while to figure out that it was the lower right corner you said. But that's not the way it increased, whatever I did with my keyboard was instantaneous. pooof - surprise!
So, now, I'm curious as to what I did, cause I wasn't aware enough to remember.
BTW, might you be a "concitoyen" of s-w NS?
Thank you Glenn.
It's been a long time since I used Lion. Not sure if there are any keystrokes to zoom the window in address book. Check the menu and see if any items appear that show the keystroke to zoom windows. In Mountain Lion, it doesn't show any.
You can also hit the green + sign in the AB window at the top left corner which will zoom the window. It may be in Lion, hitting the command key and plus sign on the keyboard may activate that. That doesn't work in ML though.
There is a feature using Option>scroll that will zoom the whole screen and not just the window. If that's what you did, than just reverse the process. If you did this, all your other application windows will appear zoomed also.
In ML, there is also a feature to double tap the front of the mouse to zoom in on a window. Don't remember if Lion had this feature. Open system preferences and check the mouse settings for zoom features also.