Modify things and test around

Options are always passed to memoir, even if I don't want them to, like 8pt...

York-Thesis/mypreamble.tex

@@ -25,9 +25,8 @@
 
 %%% ===== Folder structure
 % Important packages to use in order to work with the subfiles
-\usepackage{xr-hyper} % cross-referencing with use of hyperref
 \usepackage{subfiles} % use file structure in subfolders
-\externaldocument{\subfix{main}} % all refs available in subfiles by \ref{labelname} as usual
+\externaldocument[XR-]{\subfix{main}} % all refs available in subfiles by \ref{labelname} as usual
 
 %% NOTE: The following code make an additional paths search
 %% search to simplify the calls to \subfile if you don't want
@@ -35,11 +34,11 @@
 %% the folders' name appropriately to the list with the {dir/}
 %% syntax (brackets and trailing slash).
 %% WARNING: This slows down compilation time A LOT!!!
-\makeatletter
-\def\input@path{ %
-    {../Bibfiles/}{C-Begin/}{C-Middle/}{C-End/} % list of folders
-    }
-\makeatother
+%\makeatletter
+%\def\input@path{ %
+%    {../Bibfiles/}{C-Begin/}{C-Middle/}{C-End/}{Bibfiles/} % list of folders
+%    }
+%\makeatother
 
 
 %%% ===== BEGIN OVERLEAF_EXTERNAL_DOC
@@ -68,7 +67,6 @@
 %%% ===== List of recommended packages you need to include
 \usepackage{amsmath, amsthm}
 \usepackage{amssymb, amsfonts}
-\usepackage[final]{hyperref} % links with final option to force them to appear even in draft mode
 \usepackage{xspace} % for automatic spaces after text commands
 \usepackage{xcolor} % to use colours in different parts
 % NOTE: Package for the todo notes. Notice that it uses multiple packages such as
@@ -97,7 +95,7 @@
                              % (i.e. \u{}), see
                              % https://tex.stackexchange.com/a/170586/27664.
            ]{biblatex}
-\addbibresource{\subfix{firstbib.bib}}
+\addbibresource{\subfix{Bibfiles/firstbib.bib}}