Argo recognizes Trip Wizard’s zero-night stops as either as an out-and-back day trip activity that happens during one of the days in a multi night stop or as an activity that happens en-route to the next stop.
Notice that Broken Bow DGC happens during the 2-night stay at Beaver's Bend State Park.
Notice that Crystal Bridges happens on the travel day between Devil's Den and Bentonville.
You can tell that the open circle represents a day-trip because the route goes out and comes back to a camp (overnight stop).
You can tell that the open circle represents an en-route activity because the route just goes through it.
Notice the 0-night stop at Broken Bow followed by a 0-night stop "back to Beaver's Bend". This pattern tells Argo that Broken Bow DGC is a day trip and Argo assigns it to the first full day at Beaver's Bend.
Just add Beaver's Bend a second time, give it 0 nights, and rename it to "back to Beavers Bend" so that your Trip Wizard is easier to understand.
Notice the 0-night stop at Crystal Bridges between a 1-night stop at Devil's Den and a 2-night stop at Bentonville. This pattern tells Argo that Crystal Bridges is an enroute activity.