Making conclusion slide beamer using Rmarkdown

Question

I am trying to make a conclusion slide like this one in beamer using Rmarkdown. However, I want to make the blue rectangle at the left side of the slide with the grey one following it. The problem is that I cannot make these two rectangles. The frame title is still in place and I cannot remove it even if I try to use in the YAML header:

- \makeatletter
- \def\ps@navigation@conclusion{\setbeamertemplate{headline}{}\setbeamertemplate{footline}{}\setbeamercolor{frametitle}{bg=white, fg = white}\@nameuse{ps@navigation}}
- \makeatother

and use \thispagestyle{navigation@conclusion} on the right slide.

The rectangle also does not want to start in the bottom left corner of the slide. I am using this code now. The color of the rectangle should be the blue I defined as BlueM but that does not work either.

### Conclusion
\thispagestyle{navigation@conclusion}

\begin{tikzpicture}
\filldraw[color=red!60, fill=red!5, very thick](-1,0) rectangle (5,20);
\end{tikzpicture}

I know I can make the points with \draw[fill=white] (5.8,2) circle (0.6) node[align=center]{\includegraphics[width=0.07\textwidth]{FIGURE}}; but I do not know how I can make them start at the end of the grey rectangle. Also how to align the text next to the points is a question for me.

When using \draw[fill=white] (5.8,2) circle (0.6) node[align=center]{\includegraphics[width=0.07\textwidth]{FIGURE}}. The figure is

Can someone help me?

This is the theme I am using right now:

output: 
    beamer_presentation:
        latex_engine: xelatex
        theme: "metropolis"
        slide_level: 3
navigation: horizontal 
classoption: "aspectratio=169"
header-includes:
     - \metroset{block=fill}
     - \useoutertheme{infolines}
     - \usepackage{xcolor}
     - \definecolor{GreenM}{RGB}{107, 169, 36}
     - \definecolor{BlueM}{RGB}{6, 48, 96}
     - \setbeamercolor{title}{fg=BlueM}
     - \setbeamercolor{title separator}{fg = GreenM}
     - \setbeamercolor{author}{fg=BlueM}
     - \setbeamercolor{date}{fg=BlueM}
     - \setbeamercolor{progress bar in section page}{fg = GreenM,bg = gray}

     - \setbeamercolor{frametitle}{bg=GreenM, fg = white}
     - \setbeamercolor{normal text}{fg=BlueM}
     - \setbeamercolor{structure}{fg=BlueM}
     - \setbeamercolor{item}{fg=GreenM}
     - \setbeamercolor{block title alerted}{fg=red}
     - \setbeamercolor{section in head/foot}{fg=BlueM, bg=white}
     - \setbeamercolor{subsection in head/foot}{fg=white,bg=BlueM}
     - \setbeamercolor{author in head/foot}{fg=BlueM}
     - \setbeamercolor{date in head/foot}{fg=white, bg=BlueM}

Answer 1

If you use the remember picture option for your tikzpicture, you can position your rectangles etc with respect to the page:

\documentclass{beamer}
\usepackage{tikz}
\usetikzlibrary{positioning}

\begin{document}

\begin{frame}
\begin{tikzpicture}[remember picture, overlay]
\fill[white] (current page.south west) rectangle (current page.north east);
\fill[blue!40!black] (current page.south) rectangle (current page.north east);
\fill[lightgray!30] (current page.south) rectangle ([xshift=1.25cm]current page.north);

% red circle
\node[fill=red,draw=white,circle,font=\color{white}\Huge,ultra thick] (1) at ([yshift=-2cm]current page.north) {1};
\node[left=of 1,anchor=east,text width=.3\textwidth,align=left] {\textbf{Conclusions}\\some other text};

% blue circle
\node[fill=blue!40!black,draw=white,circle,font=\color{white}\Huge,ultra thick,below=of 1] (2) {2};
\node[left=of 2,anchor=east,text width=.3\textwidth,align=left] {\textbf{Conclusions}\\some other text};
\end{tikzpicture}
\end{frame}
    
\end{document}