Kdtyjb

I work in Beamer extensively (specifically the Madrid theme). Sometimes, my "title" is quite long. Beamer puts this title at the bottom, but when it's too long it cuts it off. I'd really like to know how to increase the size of the bottom middle rectangular footer.

Here's the code (sorry for all of the packages and commands):

documentclass[t]{beamer} %Add "mathserif" to script math lettering. "t" places all text to start at the top of each slide

usetheme{Madrid}



%Packages 

usepackage{amsmath} %Math mode

usepackage{amssymb} %Math mode

usepackage{commath}

usepackage{graphicx} %Including pictures

usepackage{color} %Define colours

usepackage{setspace} %Enables double-spacing/variable spacing

usepackage{pgfplots} %Draw graphs

usepackage{upgreek} %Insert theta symbol as unitalicized 

usepackage[version=3]{mhchem} %Chemistry equation mode ce{}

usepackage[export]{adjustbox} %Place black borders around images

usepackage{scrextend} %Used to change font size

usepackage{caption} %Used to utilize * in caption function

usepackage{subfig} %Used to place figures side-by-side with sub-captions

usepackage{siunitx} %SI Units (+ scientific notation)

usepackage{cancel}

usepackage{fancybox}

%usepackage{enumitem} %Making lists

%usepackage[english]{babel} %Lists with letters



%Erases Beamer Navigation Symbols on the bottom left

setbeamertemplate{navigation symbols}{} 

%setbeamertemplate{footline}{}

captionsetup[subfigure]{labelformat=empty}



%Defined Colours

definecolor{orangered}{RGB}{255,69,0}

definecolor{darkgreen}{RGB}{0,100,0} 

definecolor{firebrick}{RGB}{178, 34, 34}

definecolor{navy}{RGB}{0,0,128}

definecolor{lightsteelblue}{RGB}{176,196,222}

definecolor{steelblue}{RGB}{70,130,180}

definecolor{darkslateblue}{RGB}{72, 61, 139}

definecolor{forestgreen}{RGB}{34, 139, 34}

definecolor{Gold}{RGB}{218,165,32}



%Defined Colour Theme and List Sizing

setbeamercolor{structure}{fg = Gold}

setbeamertemplate{navigation symbols}{} 

setbeamerfont*{itemize/enumerate body}{size=normalsize}

setbeamerfont*{itemize/enumerate subbody}{parent=itemize/enumerate body}

setbeamerfont*{itemize/enumerate subsubbody}{parent=itemize/enumerate body}



%Opening Title Page

title{Chapter 7 - Absolute Value and Reciprocal Functions}

subtitle{Section 7.3 - Absolute Value Equations}

date{}



begin{document}

    %Slide 1

    maketitle

end{document}  

The footline template used in beamer's Madrid theme is taken from the infolines outer theme and is defined by the following code:

defbeamertemplate*{footline}{infolines theme}

{

  leavevmode%

  hbox{%

  begin{beamercolorbox}[wd=.333333paperwidth,ht=2.25ex,dp=1ex,center]{author in head/foot}%

    usebeamerfont{author in head/foot}insertshortauthorexpandafterbeamer@ifemptyexpandafter{beamer@shortinstitute}{}{~~(insertshortinstitute)}

  end{beamercolorbox}%

  begin{beamercolorbox}[wd=.333333paperwidth,ht=2.25ex,dp=1ex,center]{title in head/foot}%

    usebeamerfont{title in head/foot}insertshorttitle

  end{beamercolorbox}%

  begin{beamercolorbox}[wd=.333333paperwidth,ht=2.25ex,dp=1ex,right]{date in head/foot}%

    usebeamerfont{date in head/foot}insertshortdate{}hspace*{2em}

insertframenumber{} / inserttotalframenumberhspace*{2ex} 

  end{beamercolorbox}}%

  vskip0pt%

}

There are three beamercolorboxes with the width of one third of the paperwidth each. If you want to modify the width of the boxes you can define a different template by copying this code in your file and change the wd parameters. You can choose the widths according to your needs, but you shoud make sure that the their sum is equal to paperwidth. Moreover, you must enclose the definition between makeatletter and makeatother because @ is used in the code. An example is given by the following MWE (where the unused packaged of your example have been removed).

documentclass[t]{beamer}

usetheme{Madrid}



definecolor{Gold}{RGB}{218,165,32}



%Defined Colour Theme and List Sizing

setbeamercolor{structure}{fg = Gold}

setbeamertemplate{navigation symbols}{}



makeatletter

defbeamertemplate*{footline}{Dan P theme}

{

  leavevmode%

  hbox{%

  begin{beamercolorbox}[wd=.2paperwidth,ht=2.25ex,dp=1ex,center]{author in head/foot}%

    usebeamerfont{author in head/foot}insertshortauthorexpandafterbeamer@ifemptyexpandafter{beamer@shortinstitute}{}{~~(insertshortinstitute)}

  end{beamercolorbox}%

  begin{beamercolorbox}[wd=.6paperwidth,ht=2.25ex,dp=1ex,center]{title in head/foot}%

    usebeamerfont{title in head/foot}insertshorttitle

  end{beamercolorbox}%

  begin{beamercolorbox}[wd=.2paperwidth,ht=2.25ex,dp=1ex,right]{date in head/foot}%

    usebeamerfont{date in head/foot}insertshortdate{}hspace*{2em}

insertframenumber{} / inserttotalframenumberhspace*{2ex} 

  end{beamercolorbox}}%

  vskip0pt%

}

makeatother

%Opening Title Page

title{Chapter 7 - Absolute Value and Reciprocal Functions}

subtitle{Section 7.3 - Absolute Value Equations}

date{}



begin{document} %Slide 1

maketitle

end{document}