Set Operations: Venn Diagrams

The code that generates the previous PDF diagram:

\documentclass{standalone}
 
% Imported packages:
\usepackage{venndiagram} % Needed for drawing Venn diagrams

\begin{document}
\begin{venndiagram2sets}[showframe=false, hgap=0.2cm, vgap=0.2cm, labelA={}, labelB={}, overlap=1cm, shade=purple]
\fillBNotA % The set B \ A = B - A
% The code below sets the locations of the labels $A$, $B$, and $U$ in the diagram:
% [You don't need to change the code below:]
\setpostvennhook{%
    \draw (labelA) node[below=0.8cm] {$A\qquad$};
    \draw (labelB) node[below=0.8cm] {\color{white} $\qquad B$};
    \draw (labelNotAB) node[above right=-4pt] {$U$};
}
\end{venndiagram2sets}%
\end{document}