Size Limitation on the Modeling Canvas?

ALCON,

Does anyone know of the max size of the canvas in the modeling area in ARIS Architect? I am using the System Environment Model Type. 

I have a massive Diagram that will only fomat Horizontal - and my requirement was to have it Vertical like a decomp tree.

I am thinking i might be running up against the size limit - Personally it looks better Horizontal and easier to navaigate then the top down tree - since the model is kind of flat. Not my model and i would not have built it this way, but it has landed on my desk to deal with at the moment. 

I took a look around but could not find anything with regard to a limit for vertical or horizontal for the modeling canvas area in Architect.

Any comments appreciated - 

Augustus