I was using Instant Apps to make a very general app but I found some oddities that made the end product difficult to use. First when I click on a feature with a pop up configured, there is no way to get rid of the "selection". You can click on other tools and other parts of the map, but the pop up selection will always be there. Second, when I use the measure widget, it "selects" whatever features you click your measure in. Are these supposed to happen? or is it a bug?
