https://techcommunity.microsoft.com/discussions/edgeinsiderdiscussions/new-feature-for-web-capture---subscroller-area-selection/2250633
New Feature for Web Capture - Subscroller area selection | Microsoft Community Hub
Normally you can't use Web Capture or Smart Copy in Edge to capture the contents of the 2nd scrollbar, but now you can with this new feature added...
new featurefor webmicrosoft communitycapture