How to visualize effects of different levels in group-level effects?

How to visualize effects of different levels in group-level effects?

Such as formulas including terms of type (1|somegroupingpredictor) or (mo(income)|gender) (assuming that we want to model income as grouped by gender.

https://cran.r-project.org/web/packages/brms/vignettes/brms_monotonic.html