First of all thank you for open in split view, it is an mazing feature.
I suggest after opening split tab left pane should become master pane and right pane become slave pane.
For example left pane have search engine results or article with lot of other links;
1. When click link 1 on left(master) pane, link loads into right(slave/follower) pane.
2. I click link 2 in left pane= right pane de-load whatever is there and loads link 2 instead.
3. On left pane whatever link is clicked it loads in same left pane.
(Kind of same like split view gmail or old school RSS reader)
Please consider, these are really useful and productive feature.