Another option.
Open the Project Settings.
![https://forum.reallusion.com/uploads/images/4911ede4-f71d-4c89-b4d6-a8d7.png](https://forum.reallusion.com/uploads/images/4911ede4-f71d-4c89-b4d6-a8d7.png)
Scroll down to 2D Background and click in the box beside Background Color.
Select Black as the background and the shadows won't show in a transparent render.
Gerry
System: Win 10 Pro (21H2), Asus X99-E WS, CPU i7-5930K -3,5 GHz, 32 GB DDR4 2666-16 RAM, NVidia GTX 1080 Ti GPU - 11 GB VRAM(Driver Studio-536.99), Samsung 850 Pro 512 GB SSD, 6 TB HD storage.