Cfrgtkky

The palette above has low skip which looks ugly. How can we add a little padding like the one we get with one line titles?

documentclass[aspectratio=169, xcolor={x11names}]{beamer}



usecolortheme{seahorse}

useoutertheme{split}

useinnertheme{inmargin}



newlength{widthTextMarginLeft}

setlength{widthTextMarginLeft}{1.5mm}

newlength{widthTextMarginRight}

setlength{widthTextMarginRight}{2mm}



setbeamersize{text margin left=widthTextMarginLeft, text margin right=widthTextMarginRight}



newlength{sidebarWidth}

setlength{sidebarWidth}{0.3paperwidth}



setbeamersize{sidebar width left=sidebarWidth, sidebar width right=0cm}



begin{document}



begin{frame}{Uncovering Contents When They Cannot Fit in One Slide}



end{frame}



end{document}

The "problem" is that the last line of your first title "One Slide" does not contain any descending letters, while "Uncovering Contents" has the "g" as descending letter. If you want all titles to behave like the second case, you can add a strut after insertframetitle in the template definition:

documentclass[aspectratio=169, xcolor={x11names}]{beamer}



usecolortheme{seahorse}

useoutertheme{split}

useinnertheme{inmargin}



newlength{widthTextMarginLeft}

setlength{widthTextMarginLeft}{1.5mm}

newlength{widthTextMarginRight}

setlength{widthTextMarginRight}{2mm}



setbeamersize{text margin left=widthTextMarginLeft, text margin right=widthTextMarginRight}



newlength{sidebarWidth}

setlength{sidebarWidth}{0.3paperwidth}



setbeamersize{sidebar width left=sidebarWidth, sidebar width right=0cm}



makeatletter

setbeamertemplate{frametitle}{%

  ifbeamercolorempty[bg]{frametitle}{}{nointerlineskip}%

  @tempdima=textwidth%

  advance@tempdima bybeamer@leftmargin%

  advance@tempdima bybeamer@rightmargin%

  begin{beamercolorbox}[sep=0.3cm,left,wd=the@tempdima]{frametitle}

    usebeamerfont{frametitle}%

    vbox{}vskip-1ex%

    if@tempswaelsecsname beamer@fteleftendcsnamefi%

    strutinsertframetitlestrutpar%

    {%

      ifxinsertframesubtitle@empty%

      else%

      {usebeamerfont{framesubtitle}usebeamercolor[fg]{framesubtitle}strutinsertframesubtitlepar}%

      fi

    }%

    vskip-1ex%

    if@tempswaelsevskip-.3cmfi% set inside beamercolorbox... evil here...

  end{beamercolorbox}%

}

makeatother



begin{document}



begin{frame}{Uncovering Contents When They Cannot Fit in One Slide}



end{frame}



end{document}

Running your code, I get the proper padding. However you can use vspace at the end of the contents:

documentclass[aspectratio=169, xcolor={x11names}]{beamer}



usecolortheme{seahorse}

useoutertheme{split}

useinnertheme{inmargin}



newlength{widthTextMarginLeft}

setlength{widthTextMarginLeft}{1.5mm}

newlength{widthTextMarginRight}

setlength{widthTextMarginRight}{2mm}



setbeamersize{text margin left=widthTextMarginLeft, text margin right=widthTextMarginRight}



newlength{sidebarWidth}

setlength{sidebarWidth}{0.3paperwidth}



setbeamersize{sidebar width left=sidebarWidth, sidebar width right=0cm}



begin{document}



begin{frame}{Uncovering Contents When They Cannot Fit in One Slidevspace{0.2cm}}



end{frame}



end{document}