Der bisherige Code sieht folgendermaßen aus:
%% Zitierstil laden
\usepackage{csquotes}
\usepackage[backend=biber,style=apa, maxcitenames=3,natbib=true,doi=false,date=year]{biblatex}
\LetLtxMacro{\cite}{\citet} %Jahr in Klammern
\renewcommand{\labelnamepunct}{\addcolon\space} %Doppelpunkt statt Punkt
%Slash statt Komma
\DeclareDelimFormat*{multinamedelim}{/}
\DeclareDelimFormat*{finalnamedelim}{}
\DeclareDelimAlias{finalnamedelim}{multinamedelim}
\DeclareDelimFormat*{finalnamedelim:apa:family-given}{}
\DeclareDelimAlias{finalnamedelim:apa:family-given}{multinamedelim}
%Autoren fett
\AtBeginBibliography{%
\renewcommand*{\mkbibnamegiven}[1]{\mkbibbold{#1}}%
\renewcommand*{\mkbibnamefamily}[1]{\mkbibbold{#1}}%
\renewcommand*{\mkbibnameprefix}[1]{\mkbibbold{#1}}%
\renewcommand*{\mkbibnamesuffix}[1]{\mkbibbold{#1}}%
}
Minimalbeispiel:
[code] \documentclass[12pt,a4paper]{article}
\usepackage[german]{babel} %Sprache
\usepackage{csquotes}
\usepackage[backend=biber,style=apa, maxcitenames=3,natbib=true,doi=false,date=year]{biblatex}
\LetLtxMacro{\cite}{\citet} %Jahr in Klammern
\renewcommand{\labelnamepunct}{\addcolon\space} %Doppelpunkt statt Punkt
\DeclareDelimFormat*{multinamedelim}{/}
\DeclareDelimFormat*{finalnamedelim}{}
\DeclareDelimAlias{finalnamedelim}{multinamedelim}
\DeclareDelimFormat*{finalnamedelim:apa:family-given}{}
\DeclareDelimAlias{finalnamedelim:apa:family-given}{multinamedelim}
\AtBeginBibliography{%
\renewcommand*{\mkbibnamegiven}[1]{\mkbibbold{#1}}%
\renewcommand*{\mkbibnamefamily}[1]{\mkbibbold{#1}}%
\renewcommand*{\mkbibnameprefix}[1]{\mkbibbold{#1}}%
\renewcommand*{\mkbibnamesuffix}[1]{\mkbibbold{#1}}%
}
\addbibresource{Literatur.bib} %Literaturquelle
\begin{document}
Test \footnote{\cite{Schmidt.2018}}
\printbibliography
\end{document} 