Need "Find Next" when searching for categories to include in report

I have many categories. When I create or edit a report and need to choose the categories to include, I can only search once. I'd like a way to find the next instance of my search so I can find the category that I'm looking for when it isn't the first one. Also, it would be great if the screen could be made larger with a larger box for the list of categories. The current screen has a small area for the category list which makes it hard to look through all the categories.