Sry I was super out of it when I posted that. In AVS when you press L a list of all presets comes up. I'd like if I can make this list either not be visible or appear in a separate window
Are you sure you're doing it right? 'L' is used by the main AVS window, its for opening media files, and not AVS presets.
Loading AVS presets is (usually) done by right-clicking the AVS window. Or through the editor via [Preset] > [Load...]