Cannot change the style of footnotes using Fontspec and Garamond 3LTPro (XeLaTex)

Question

I’m trying to typeset a book using fontspec and an OpenType font (Garamond3LTPRo, supplied by my publisher), with Memoir. At first, I used LaTex because using the required font seemed optional (it was not). So I switched to XeLaTex and Fontspec, but I can’t seem now to modify in any way the footnotes (neither the footnotemark nor the indentation). The notes should be in a block paragrah, without indentation, and the footnotemark flush left, but not in the margin. Is it due to the font used ? I’ve reviewed all questions linked to footnotes but didn’t find anything that seem to work.

\documentclass[a4paper,12pt,twoside,openright]{memoir}
\settrimmedsize{23cm}{16cm}{*}
\setpagecc{23cm}{16cm}{*}
\setlrmarginsandblock{2.5cm}{*}{1}
\setulmarginsandblock{3.8cm}{3.7cm}{*}
\checkandfixthelayout

\pagestyle{myheadings}
\makepagestyle{myheadings}
\makeevenhead{myheadings}{\thepage}{\textsc{titulus}}{} 
\makeoddhead{myheadings}{}{\scshape\rightmark}{\thepage}

\setlength{\footmarkwidth}{1.8em}
\setlength{\footmarksep}{0em}
\footmarkstyle{#1\hfill} %notes en §, ms avec appel seul, indenté à gauche ds marge

\usepackage{fontspec}
\setmainfont[BoldFont={Garamond3LTPro-Bold}, 
ItalicFont={Garamond3LTPro-Italic}, BoldItalicFont={Garamond3LTPro-BoldItalic}]{Garamond3LTPro}

\usepackage{perpage}
\MakePerPage{footnote}
\usepackage{lipsum}
\usepackage{polyglossia}
\setmainlanguage{french}
\setotherlanguages{greek,spanish,italian,english,german}
\newfontfamily\greekfont[Script=Greek]{Times New Roman}

\begin{document}
\lipsum[1]
This is a test to add a footnote\footnote{And this is footnote 1.}.
And to add another footnote\footnote{\lipsum[2]}.
\lipsum[1]
\end{document}}n

Answer 1

Someone suggested to me to use the footmisc package, and it does work, with additional customizing to change the footnotemarker in the footer (found in this post).