Just a simple preset I've made in content manager to make previews look better. Includes two previews, with black and grey background. Grey one is for those who want the preview background to blend in with the menu. Note: you need to change the CM background itself to pitch black in order to make it work.
Installation: C:\Users\Username\AppData\Local\AcTools Content Manager\Presets\Custom Previews
(black)
(gray)
(more previews)
Installation: C:\Users\Username\AppData\Local\AcTools Content Manager\Presets\Custom Previews
(black)
(gray)
(more previews)