Schneider XW+ 6848 Removing External Transfer Switch

I have 2 schneider xw+ 6848 inverters with generator power backup and 5 evault max batteries with 18kw of pv array coming in on 3 100 600 charge controllers. Currently it's set up with external bypass transfer relay so that either the generator power goes directly to load as well as to the inverter chargers or when the generator is stopped then the load goes off the inverter (batteries). Wondering if that external transfer relay can be removed and feed generator power directly into the inverters and let the inverters do the transfer to reduce power switchover time as the lights still flicker a bit when the power switches with the external contactor. My friend has a solark inverter and the way i understand it's set up so that when the generator goes then all the power still goes through the inverter with no need to transfer the power. Just wondering if the schneider has the same capability and which settings would need to be changed. The reason that there is an external contactor is because it was needed for the old system. Any insight would be greatly appreciated. BTW it's a 20kw generator. Thanks