In the examples we use Makie.jl for plotting.
Makie comes with a few backends. In the documented examples we use CairoMakie since this backend works well on headless devices, that is, devices without monitor. Because the documentation is automatically built via GitHub actions the CairoMakie backend is necessary. However, users that want to run the examples on devices with a monitor might want to change to GLMakie that displays figures in an interactive window. To do that you need to install GLMakie, e.g.,
using Pkg pkg"add GLMakie"
using CairoMakie with