Why I cant see the Hebrew titles?

Question

I'm trying to write a document that contains English, so I put:

\begin{english}
 % Some lines....
\end{english}

And then, if I put TOC at the beginning, this is the result:

No titles of parts, sections,...

If I'm removing the TOC or the english part - it works, but not with both :-(
Do you know why and how can I solve it?

MWE:

% Preview source code
%% LyX 2.3.6.1 created this file.  For more info, see http://www.lyx.org/.
%% Do not edit unless you really know what you are doing.
\documentclass[a4paper,english,hebrew,numbers=noenddot]{scrartcl}
\usepackage{amsmath}
\usepackage{amsthm}
\usepackage{fontspec}
\usepackage{fancyhdr}
\pagestyle{fancy}
\setlength{\parindent}{0bp}
\usepackage{color}
\usepackage{pifont}
\usepackage[unicode=true,pdfusetitle,
 bookmarks=true,bookmarksnumbered=false,bookmarksopen=false,
 breaklinks=false,pdfborder={0 0 0},pdfborderstyle={},backref=false,colorlinks=true]
 {hyperref}
\hypersetup{
 linkcolor=blue}
\makeatletter
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% LyX specific LaTeX commands.
\pdfpageheight\paperheight
\pdfpagewidth\paperwidth
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% User specified LaTeX commands.
\newfontfamily\hebrewfont[Script=Hebrew]{David CLM}
\newfontfamily\hebrewfonttt[Script=Hebrew]{Miriam Mono CLM}
\newfontfamily\hebrewfontsf[Script=Hebrew]{Bellefair}
\AtBeginDocument{
\renewcommand\footnoterule{%
  \kern -3pt
  \hbox to \textwidth{\hfill\vrule height 0.4pt width .4\textwidth}
  \kern 2.6pt
}}
% Commands:
\makeatother
\usepackage{polyglossia}
\setdefaultlanguage{hebrew}
\setotherlanguage{english}
\begin{document}
\tableofcontents{}
\part{שלום}
\section{שלום}
\begin{english}
abcd
\end{english}
\end{document}

P.S. I tried to change the font to FreeSans and although this - the titles are still missing

Thank you!

Answer 1

Using the font Arial and

\newfontfamily\hebrewfont[Script=Hebrew]{Arial}
\newfontfamily\hebrewfonttt[Script=Hebrew]{Arial}
\newfontfamily\hebrewfontsf[Script=Hebrew]{Arial}

I get the same result.

But with

\setmainfont{Arial}
\setmonofont{Arial}
\setsansfont{Arial}

the result is fine

(I am using TeXstudio, so I removed the LyX specific LaTeX commands. They are not needed with xelatex or lualatex. They will be set by the a4paper of the class. https://tex.stackexchange.com/a/425649/161015 )

    \documentclass[a4paper,english,hebrew,numbers=noenddot]{scrartcl}
    \usepackage{amsmath}
    \usepackage{amsthm}
    \usepackage{fontspec}
    \usepackage{fancyhdr}
    \pagestyle{fancy}
    \setlength{\parindent}{0bp}
    \usepackage{color}
    \usepackage{pifont}
    \usepackage[unicode=true,pdfusetitle,
    bookmarks=true,bookmarksnumbered=false,bookmarksopen=false,
    breaklinks=false,pdfborder={0 0 0},pdfborderstyle={},backref=false,colorlinks=true]
    {hyperref}
    \hypersetup{
        linkcolor=blue}
\makeatletter

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% LyX specific LaTeX commands.
%\pdfpageheight\paperheight
%\pdfpagewidth\paperwidth


%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% User specified LaTeX commands.
%\newfontfamily\hebrewfont[Script=Hebrew]{DavidCLM}
%\newfontfamily\hebrewfonttt[Script=Hebrew]{Miriam Mono CLM}
%\newfontfamily\hebrewfontsf[Script=Hebrew]{Bellefair}


%% IT DOES NOT WORK
%\newfontfamily\hebrewfont[Script=Hebrew]{Arial}
%\newfontfamily\hebrewfonttt[Script=Hebrew]{Arial}
%\newfontfamily\hebrewfontsf[Script=Hebrew]{Arial}


% THIS WORKS OK ! <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
\setmainfont{Arial}
\setmonofont{Arial}
\setsansfont{Arial}

\AtBeginDocument{
    \renewcommand\footnoterule{%
        \kern -3pt
        \hbox to \textwidth{\hfill\vrule height 0.4pt width .4\textwidth}
        \kern 2.6pt
}}  
% Commands:

\makeatother

\usepackage{polyglossia}
\setdefaultlanguage{hebrew}
\setotherlanguage{english}

\begin{document}
    \tableofcontents{}

    \part{שלום}

    \section{שלום}

    \begin{english}
        abcd
    \end{english}
\end{document}

Using other fonts. In this example the .ttf files in sub-directories under the directory FONTS of the working directory.

% !TeX TS-program = xelatex
\documentclass[a4paper,english,hebrew,numbers=noenddot]{scrartcl}
\usepackage{amsmath}
\usepackage{amsthm}
\usepackage{fontspec}
\usepackage{fancyhdr}
\pagestyle{fancy}
\setlength{\parindent}{0bp}
\usepackage{color}
\usepackage{pifont}
\usepackage[unicode=true,pdfusetitle,
bookmarks=true,bookmarksnumbered=false,bookmarksopen=false,
breaklinks=false,pdfborder={0 0 0},pdfborderstyle={},backref=false,colorlinks=true]
{hyperref}
\hypersetup{
    linkcolor=blue}
\usepackage{polyglossia}
\setdefaultlanguage{hebrew}
\setotherlanguage{english}
% using other fonts. .ttf files in subdirectories under the directory FONTS of the working directory <<<<<<<<<<<<<<<<
\setmainfont[
Path =./FONTS/TaameyDavidCLM/,
Ligatures = TeX ,
Script = Hebrew,
Extension=.ttf,
UprightFont=-Medium ,
BoldFont=-Bold,
ItalicFont=-MediumOblique,
BoldItalicFont=-BoldOblique,
Scale=1.0      % Adjust to match Latin font
]{TaameyDavidCLM}
\setmonofont[
Path =./FONTS/MiriamMonoCLM/,
Script = Hebrew,
Extension=.ttf,
UprightFont=-Book,
BoldFont=-Bold,
ItalicFont=-BookOblique,
BoldItalicFont=-BoldOblique,
Scale=1.0      % Adjust to match Latin font
]{MiriamMonoCLM}
\setsansfont[
Path =./FONTS/DejaVuSans/,
Ligatures = TeX ,
Script = Hebrew,
Extension=.ttf,
UprightFont=* ,
BoldFont=-Bold,
ItalicFont=-Oblique,
BoldItalicFont=*-BoldOblique,
Scale=1.0      % Adjust to match Latin font
]{DejaVuSans}
\AtBeginDocument{
    \renewcommand\footnoterule{%
        \kern -3pt
        \hbox to \textwidth{\hfill\vrule height 0.4pt width .4\textwidth}
        \kern 2.6pt
}}
\begin{document}
    \tableofcontents
\part{שלום}

\section{שלום}

\begin{english}
    abcd
\end{english}


\section{בראשית}
\textbf{בְּרֵאשִׁ֖ית}
\textit{יְהִ֣י א֑וֹר}
\bigskip
\texttt{ \textbf{וַיַּ֧רְא אֱלֹהִ֛ים אֶת־הָא֖וֹר כִּי־ט֑וֹב וַיַּבְדֵּ֣ל אֱלֹהִ֔ים בֵּ֥ין} הָא֖וֹר וּבֵ֥ין הַחֹֽשֶׁךְ׃ }
\section{מבוא}
זוהי עובדה מבוססת שדעתו של הקורא תהיה מוסחת עלידי טקטס קריא כאשר הוא יביט בפריסתו.
\end{document}