Code: Alles auswählen
\documentclass[titlepage, listof=totoc, bibliography=totoc, ngerman]{scrartcl}
\usepackage[utf8]{inputenc}% bei aktueller TeX-Distribution obsolet
\usepackage[T1]{fontenc}
\usepackage{lmodern}
\usepackage{babel}
\usepackage[left=4cm, textwidth=15.0cm, top=3cm, bottom=2cm, headsep=1.0cm, foot=1.5cm]{geometry}
\usepackage[fleqn,intlimits]{amsmath}
\setlength{\mathindent}{1cm}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{mathtools}
\usepackage[fleqn,intlimits]{empheq}
\usepackage{tcolorbox}
\usepackage[locale=DE]{siunitx}
\tcbuselibrary{theorems, skins}
\newtcbtheorem[
list inside=formula
]{formula}{Formel}{
enhanced,
coltitle=black,
colback=white,
fonttitle=\bfseries,
description font=\normalfont,
boxrule=0.8pt,
sharp corners,
% ams align,
ams nodisplayskip,% <- eingefügt
attach boxed title to top center={yshift=4mm},
boxed title style={colframe=white, colback=white}
}{formula}
\begin{document}
\tcblistof[\addsec]{formula}{Formelverzeichnis}
\listoffigures
\section{Abschnitt}
\begin{formula}{Test 1}{}
\begin{align}
\text{Test 1} = \frac{\text{A}}{\text{B}} * \SI{100}{\percent}
\end{align}
\end{formula}
{\noindent\footnotesize Quelle: In Anlehnung an\par}
\begin{formula}{Test 2}{}
\begin{subequations}
\begin{align}
y & = d\\
& = cx+d\\
& = bx^{2}+cx+d\\
& = ax^{3}+bx^{2}+cx+d
\end{align}
\end{subequations}
\end{formula}
\begin{formula}{Test 3}{}
\begin{align}
\text{Test 3} = \frac{\text{A}}{\text{B}} * \SI{100}{\percent}
\end{align}
\end{formula}
\end{document}