Figured out this button on the bottom left in the mean time as well. Though the method using the context menu is really a way for me doing this, able to do this almost blindly. 

I assigned a short key or shortcut to this function whitch i can learn to use instead. Maybe worthwhile to do to taking this step upgrading to P13; At least Superfly Render engine now is compatible to my RTX GPU.

Thanks for the effort, maybe over time it will be corrected anyway by the Poser developers. Perhaps my short key is even a quicker/better solution in my case. :-)