I would like to have an option to disable the window preview popover in the new app switcher. Thanks for considering my request!
This is available in the latest update. It's great.
With Advanced conditions, I'm going to turn off the pop-ups when I'm using a vertical desktop and turn them on when it's horizontal.
Ah yes I forgot to mention that this has been added 
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Looks good, thank you! 
Sorry to resurrect a thread that is (almost exactly) a year old, but I have the opposite question. Is there any way to scale the preview window to be larger?
It would be ideal if the resize/snap shortcuts didn't also scale, just the thumbnail, but I'd be happy if the entire panel were able to be adjusted. Sometimes my window names don't diverge by much, and I'd like to use the thumbnails to disambiguate which window I'm actually looking at. It would be great if there was a slider that would allow me to scale the thumbnail by a percentage.
Thank you for the work you put into this awesome tool!