Hi @idegani,
As far as I am aware, it's not possible to have a particular configuration loaded on power up as the on-board FPGA will not maintain it's configuration once power is disconnected.
The workaround that might work for you would be to use the "Continue" option for what the device does when WaveForms is closed within the WaveForms Device Manager. As long as the device is still receiving power (either over USB or via an external supply), the device will continue to operate in whatever configuration/state it was last set in. I routinely use this when I'm testing other devices but want to limit the total USB activity and ports I am using.
There are a couple of other threads that discuss this option here:
Let me know if you have any questions.
Thanks,
JColvin