[EDIT!] I changed my code to:
\documentclass[10pt]{article}
\usepackage[a4paper, left=2cm,top=0.8cm,right=2cm,bottom=3.3cm,headheight=61pt, footskip=61pt, includehead]{geometry}
\usepackage[default]{opensans}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{graphicx}
\usepackage[ngerman]{babel}
\usepackage{multicol}
\usepackage{tabularx}
\newcommand{\cvTabItem}{\hspace{2px}\includegraphics[width=0.3cm]{images/bullet.png}\hspace{5px}}
\begin{document}
\begin{multicols*}{2}
\begin{center}
\setlength{\tabcolsep}{5pt}
\begin{tabularx}{\linewidth}{@{}lX@{}}
\cvTabItem 2015 – 2019 & Studium in der Fachrichtung „B.Sc. - Computervisualistik“ an der Universität Koblenz-Landau. Schwerpunkt auf Bildverarbeitung und Computergrafik.\\
\end{tabularx}
\end{center}
\end{multicols*}
\end{document}
So I used the tabularx line from David's answer. But now I get a underfull \hbox?
[EDIT END]
I use following code to get a tabular with a custom itemize icon in a multicol. (I hope it is understandable). In the full example I have more code, thats why my \usepackage-list is that long.
So my question is why do I get a \overfull warning and how can I fix that? I have read some similar questions, but I can't find a solution for my situation.
\documentclass[10pt]{article}
\usepackage[export]{adjustbox}
\usepackage[a4paper, left=2cm,top=0.8cm,right=2cm,bottom=3.3cm,headheight=61pt, footskip=61pt, includehead]{geometry}
\usepackage[default]{opensans}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage[ngerman]{babel}
\usepackage{multicol}
\usepackage{enumitem}
\usepackage{csquotes}
\usepackage{anyfontsize}
\makeatletter
\renewcommand\LARGE{\@setfontsize\LARGE{18pt}{20}}
\setlength\parskip{0.7cm}
\renewcommand{\paragraph}{\@startsection{paragraph}{4}{\z@}{-20px\@plus -30ex \@minus -.20px}{2px \@plus .5em}{\normalfont\MakeUppercase}}
\makeatother
\newcommand{\minsp}{%
\vspace{-0.7cm}
}%
\newcommand*{\cvItem}{\item[{\rule{0.44cm}{0.32cm}}]}
\setlist[itemize]{leftmargin=15px,parsep=0pt} % Einrückung Bullets in Liste
%Command for Subitem
\newcommand{\cvSubItem}[1]{%
\begin{itemize}%
\cvItem {#1}%
\end{itemize}%
}%
%Command for Item in Tabular
\newcommand{\cvTabItem}[1]{%
\setlist[itemize]{leftmargin=10px,parsep=0pt}%
\begin{minipage}[t]{0.5\textwidth}\cvSubItem{#1}\end{minipage}
}
\begin{document}
\begin{multicols}{2}
\paragraph{Ausbildung:}
\minsp
\begin{center}
\setlength{\tabcolsep}{5pt}
\begin{tabular}{p{0.3\linewidth}p{0.6\linewidth}}
\cvTabItem { 2015 – 2019 } & Das ist ein Test für eine mehrzeilige Tabelle in Verbindung einer Minipage zu Demonstrationszwecke.
\end{tabular}
\end{center}
\end{multicols}
\end{document}
images/bullet.png}
please useexample-image
or a\rule{1cm}{1cm}
or whatever size shows the problem.tabular
here\begin{tabularx}{\linewidth}{p{0.3\linewidth}p{0.6\linewidth}}
should be\begin{tabular}{p{0.3\linewidth}p{0.6\linewidth}}