Hello,
Question 1. What's the difference between the editing and fieldinventory views?
The views are designed for different users. The editing view has full editing capabilities versus the fieldinventory view has more limited editing capabilities and was designed with bigger symbology size for mobile users. To view the editing capabilities got to the feature layer view item page, click on the Settings tab and scroll to the Editing section to see the settings.
Question 2. What's the difference between Sewer Viewer Map vs the Sewer Mobile Viewer?
The Sewer Viewer Map is designed for the Sewer Viewer application for office/web use versus the Sewer Mobile Viewer which is designed to be used in the Field Maps and provides larger symbology.
Another helpful tip is every item should have a summary and description to explain a bit more about the items use.