I have delegated Map Value rules in Pega 8.6.2 and tried to render the same using a mashup. On Edit of the delegated rule it opens in a modal dialog without vertical scroll bar. This issue is similar to the one discussed in the following URL : https://support.pega.com/question/scroll-bar-not-displayed-delegated-rule.
Unable to open the Support Article mentioned in the link.
Can you please let us know what is the local change suggested.
The rules which are delegated in previous versions of PRPC need to be re-delegated using the new Delegate option after upgrade to be available under Configurations
Try inspecting the vertical scrollbar using dev tools and check what css “overflow” style it has.
Could you check if the markup for the close there in the DOM or not? How is the close icon you see for the other harness/WorkItems?
Checx the css markup
Try adding a style overflow-x:auto on the fly and if that helps, you can create an appropriate CSS selector and give it overflow:auto.