How do I resize schematic page size?

The zoom was working fine, but the size of the background page was huge. The gray part of the scroll bar ended up being just a fine line and hard to grab. I wanted to shrink the overall page size since I don’t need all that empty space.
Finally, I just selected all, copied it and started a new drawing and pasted it. It would seem that there must be a way to change page size since I accidentally made it larger, but I couldn’t find it.
Thanks for the suggestion.

Dennis