Changing line caps in Map Viewer

[JonathanTanis1]

Is there any way to change the rounded line cap style in Map Viewer? We work with a lot of segmented linear features like this, and rounded caps end up overlapping the adjacent segments.

[RussRoberts]

We don't expose caps yet in Symbol Styler. If you wanted line styles with different caps you can publish a web style with the cap styling you prefer and that will be honored. 

https://www.esri.com/arcgis-blog/products/arcgis-online/mapping/use-published-2d-symbols-in-arcgis-o...