At 3.14.16, I'm trying to learn a little more about Geometry Generator, in this case convex hull. I created a simple test point layer with six points. I then used Geometry Generator with the expression convex_hull($geometry), expecting an outline hull to display. However, none appeared, as shown in the screenshot below. Only the original points appear.
In my search for a solution, I came across this SE GIS post, where convexHull($geometry) was successfully used. Unfortunately, that expression did not result in a outline for my points.
How do I display a convex hull around a point layer using Geometry Generator?