The Source- Destination Strategy will allow the traffic which is sent from a specific source IP to a specific destination IP to be sent to the same interface.
If you want to create an SD-WAN Rule which will override the implicit rule. You can create a manual strategy and you can assign specific source addresses and destination address to go out from specific WAN Interface. Always configure SD-WAN Rules as most specific at the begining. It will hit those rules first, any traffic that doesnt match those rules will hit the strategy of implicit policy.
In your case, as I can see from the attached screenshot, you have SD-WAN Rules with Source and destination all with criteria packet loss.
This will overide the implicit rule strategy. Traffic will reach internet based on the best WAN interface with less packet loss.
To override this, you can create Source IP ( Your Subnet) and destination IP ( ariba.com), and choose manual strategy and choose specific Interface preference.
As another option, you can delete any SD-WAN rule configured as ALL To ALL. So the traffic hit the implicit rule.