Welcome to the community.
There are a couple of different ways to do this. Probably the most straighforward one is to utilize one of the relays on the board as a “Pulse Timer”. Its outlined a little strangely in the documentation, but the gist is that you will trigger this time once every x hours, y minutes, and z seconds (configurable) to keep it from finishing. If the Pulse Timer ever finishes it will pulse the relay. The relay will route the board’s power supply through the common and NC position. When the relay pulses the board will lose power and reset the status of all relays to the NC position. This will apply power back to the board as the Pulse Timer relay will revert to the NC position along with all of the other relays.
The one downside is that you will either need to connect the loads to the NC of all relays. This means the relay has to be “On” or activated for the corresponding load to be “Off” or not powered. It reverses the on off logic commonly used and should be noted.
Additionally there is a relay power-up status map you can configure into the board. This is outlined in section 9.1 of: https://ncd.io/proxr-quick-start-guide/
I would use this setting in conjunction with that outlined above as it will momentarily apply power to all loads on the relay controller as opposed to momentarily disconnecting all loads on the relay controller. You can use this to turn off non-necessary loads by setting their relays to be active on boot.
The thought being its better to gain lighting temporarily where its not need than to lose lighting temporarily where it is.