The Incollection style looks like this:

However it should look like this:
Vader, Darth. "How to beat darth vader". In: Star Wars, hg. v. Skywalker, Luke und H. Solo. Naboo 2018, pp. 130-154.
So the following things need to be changed:
- add hg. v. before publisher
- replace semicolon with comma
- the name of the publisher should be first the surname and then the forename; the second publisher should be his initial and then the surname
- After the publisher there should be a fullstop instead of a comma
- The address should be displayed before the year
How can I change those things?
\RequirePackage{filecontents}
\begin{filecontents}{\jobname.bib}
@InCollection{vader,
author = {Darth Vader},
title = {How to beat darth vader},
booktitle = {Star Wars},
year = {2018},
% address = {Naboo}
publisher = {Luke Skywalker; H. Solo},
pages = {123-134},
}
\end{filecontents}
\documentclass{article}
\usepackage[style=authortitle]{biblatex}
\addbibresource{\jobname.bib}
\renewbibmacro[article]{in:}{}
\begin{document}
Cite \footcite{vader}
\printbibliography
\end{document}

