What is the best practice for setting the enum numbering for every level individually?

[SillyFreak]

Isn’t using numbly as the solution (combined with full) also the answer here?

How can I change the heading numbering for headings of different levels differently?

Use numbly. #import "@preview/numbly:0.1.0": numbly #set heading( numbering: numbly( "Top {1}:", "{1}.{2}.", ), ) = First section == Unterpunkt == Zweiter Unterpunkt gives Top 1: First section 1.1. Unterpunkt 1.2. Zweiter Unterpunkt