In my project when I add Web Maps and Layers then click on the three dots next to a layer there is an info icon next to Setup layer.
Hovering over the info icon I have the option to click a hyperlink to learn more but it takes me to https://docdev.arcgis.com/en/business-analyst/web/web-maps-and-layers.htm#ESRI_SECTION1_52B4D034D267.... Modifying the URL by removing dev takes me to what looks like the right page.
Solved! Go to Solution.