I did this and all my previews are from 3rd person perspective.
Yes, the default viewing angle is not optimal there. This was a common request, so the latest version of my thumbnail handler can change the viewing angle.
However, because it’s pretty new, there’s no graphical interface yet and it requires editing the registry. You can find the details here: https://papas-best.com/stlthumbnails_en#custom_colors
In short, create the approriate registry key and add the values InitialEyeYawDegrees
with the respective degrees of rotation. Don’t forget to update to the latest version
and to clear your thumbnail cache
, or the changes won’t take effect.
Please let me know if this works for you!