ZioMio:
The four arrow full screen icon perhaps.
Sounds like that's what Jim is referring to anyway.
YankeeJim:
There should be a volume icon to the left of it.
I prefer the Maxthon full screen mode. The WGT mode is pretty fuzzy and doesn't allow you to use the chat window.
For the OP, you can zoom in properly during a game by right clicking and selecting zoom in from the pop up menu. This is handy when you're moving the marker on approach shots.