Hm, any news on this? I started using premium today and I'm having the same issue.
Board size differences live chess basic and premium
Show and hide the chat window can not be the best solution, why not have the game tab that we have in the basic version.

jacklee, try going into your settings page (main page not the one in live premium)
http://www.chess.com/home/livechess_settings.html
Change the board size to what you want it to be, then save settings.
Then go into live chess.
If you're still having problems, let me know what size board it is you're trying to get and which browser and version you're using so i can try and replicate this to see where the problem is.

Done that...to no avail. It is still stuck on a small board on the premium thingy.
I am using firefox and am trying to get maximun.
Thanks

Oh , yeah, however, that only works when firefox is on 'full scree mode' ie F11
What is all that about?

I don't have mine on F11, the slider works fine on normal view. It may not if you've been trying to resize the page using Ctrl + though. You'd need to clear your cache, refresh live chess, then just use either main page settings or the slider.
Resizing the page using zoom messes with the view in live premium

Also, I think the chat thing should be on the right hand side. Who thought it would be a good idea to put it under the board where it would actually mess things up...???!

Not everyone has a monitor wide enough to accomodate game - chat - main chatroom all side by side.
Notice the difference between live premium and live back, and the sizes of the windows/frames in there.

I always play live chess with the basic feature. The board occupies much more space. Honestly, it is much more confortable. It's a pity, but this is as I experience it

with the premium feature there is lots of empty space, if there is solution for this I'm willing to hear

Also, I think the chat thing should be on the right hand side. Who thought it would be a good idea to put it under the board where it would actually mess things up...???!
I agree with that.
And yes, F11 works but how fun is that, feels like an emergency solution.

In fact is far better now that some time ago, let me a bit of time to get the screenshots
Great news!!! Finally can start using the new live chess and the super new board analysis! yeay!!!
Thanks very very much!!