recreate Window Tidy patterns in Mosaic

I'm still using Window Tidy because it's simpler, but it has started not handling multiple monitors correctly (congratulations on making it work for so long) - how would I recreate all my Window Tidy arrangements in Mosaic? screenshot attached. I started with making 12 advanced layouts for the 4x3 window arrangement (at 0,33,67% and 0,25,50,75%, respectively), in the hope of being able to drag any window onto any of these 12 panels on my 32" 4K LG display. However, only one of those appears in the Mosaic advanced layouts, top right. I'd like to have it just like the "large window left" panel, one wondiw where I can drag a particular file to a particular position. How do I do that? thanks!