Let IP flow verify show which NSG is matched.
The current implementation of IP flow verify in network watcher shows the name of the rule that is matched for allowing/denying traffic. It doesn't show the name of the effective NSG itself (only the rule in an NSG). A useful addition would be to show the name of the NSG in additional to the matched rule. A click through to the NSG for instant changes would help as well.
Displaying the NSG in addition to the rule, as well as adding a link to NSG is great feedback, and we will be reviewing it as we make improvements to IP Flow Verify.