Fix enumerate/itemize environment spacing

Question

I am using a template (https://github.com/glederrey/EPFL_thesis_template/tree/master/head) for a document. It has a series of issues when introducing a variety of environments (Theorem, Lemma, Proof, Enumerate, Itemize).

I managed to fix the issue around theorems with this code:

\makeatletter
\def\thm@space@setup{%
  \thm@preskip=1pt
  \thm@postskip=0pt
}

But the problem just keeps presenting itself in other forms. Like with this enumerate:

Or with this proposition (also appears for Lemma):

Where the Proposition environment is defined as follows:

\newtheorem{proposition}{Proposition}

Otherwise, if I have a Theorem, followed by some text and then a Proof:

Could you help me fix the issue for all of them? Is it possible?

Answer 1

Add before \begin{document}

\usepackage{enumitem}
\setlist{nosep} %% Remove the vertical space altogether in all lists

Before

After