I had similar issues on my laptop (only 768 height) with several plugins like Addictive Drums 2. But when I reduce the size of the plugin window (with the double arrow on the window frame), then the plugin window shows scrollbars and so I can reach everything of the plugin. The only drawback is that I have to do it each time when I open the plugin window again.
I don't know whether this runs with your Steven Slate Drums plugin, too? But in fact it should be the same with all plugins, if the plugins do not restrict resize.
Marc