This file is indexed.

/usr/share/lyx/layouts/slides.layout is in lyx-common 2.2.2-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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#% Do not delete the line below; configure depends on this
#  \DeclareLaTeXClass{Slides}
#  \DeclareCategory{Presentations}
# Slides textclass definition file.
# Author : John Weiss <jpweiss@idsi.net>
#
# Based on the Article textclass "article.layout"
#


Format 60
Columns        1
Sides          1
PageStyle      Plain


DefaultFont
	Family       Sans
	Series       Medium
	Shape        Up
	Size         Largest
	Color        None
EndFont


ClassOptions
	FontSize   |
	Pagestyle  plain|headings|empty
	Other      "dvips"
End


Preamble
	\newcounter{slidetype}
	\setcounter{slidetype}{0}
	\newif\ifLyXsNoCenter
	\LyXsNoCenterfalse
	\newcommand{\noslidecentering}{
	   \LyXsNoCentertrue%
	}
	\newcommand{\slidecentering}{
	   \LyXsNoCenterfalse%
	}
	\newcommand{\lyxendslide}[1]{
	   \ifLyXsNoCenter%
	        \vfill%
	   \fi%
	   \ifcase \value{slidetype}%
	        \or % no action for 0
	        \end{slide} \or%
	        \end{overlay} \or%
	        \end{note}%
	   \fi%
	   \setcounter{slidetype}{0}
	      \visible
	}
	\AtEndDocument{\lyxendslide{.}}
EndPreamble


Style Standard
	Category          MainText
	Margin            Static
	LatexType         Paragraph
	LatexName         dummy
	ParIndent         M
	ParSkip           0.4
	Align             Block
	AlignPossible     Block, Left, Right, Center
	LabelType         No_Label
End


#  Note that the "Section" family of environments is missing, as is
#  "Title" "Bibliograpy" "LaTeX-Title" "Author" "Abstract" and "Date".
#  I may choose to reintroduce these and/or remove others at a later
#  date.
#  -jw 10/2/96

Input stdinsets.inc
Input stdlists.inc
Input stdlayouts.inc
Input lyxmacros.inc
Input stdcounters.inc
Input stdfloats.inc

NoStyle Address
NoStyle Right_Address


Style Slide
	TocLevel          1
	LatexType         Command
	LatexName         lyxnewslide
	KeepEmpty         1
	Margin            Static
	NextNoIndent      1
	ParSkip           0.4
	TopSep            1.0
	BottomSep         1.0
	ParSep            0.5
	Align             Left
	LabelType         Static
	LabelBottomSep    0.5
	LabelSep          xx
	LeftMargin        "New Slide:xx"
	LabelString       "New Slide:"
	Font
	  Family          Typewriter
	  Series          Bold
	  Size            Large
	  Color           Blue
	EndFont
	LabelFont
	  Family          Typewriter
	  Size            Large
	  Color           Blue
	EndFont
	Preamble
		\newcommand{\lyxnewslide}[1]{
			 \lyxendslide{.}
			 \setcounter{slidetype}{1}
			 \begin{slide}
		}
	EndPreamble
End


Style Overlay
	LatexType         Command
	LatexName         lyxnewoverlay
	KeepEmpty         1
	Margin            Static
	NextNoIndent      1
	ParSkip           0.4
	TopSep            1.0
	BottomSep         1.0
	ParSep            0.5
	Align             Left
	LabelType         Static
	LabelBottomSep    0.5
	LabelSep          xx
	LeftMargin        "New Overlay:xx"
	LabelString       "New Overlay:"
	Font
	  Family          Typewriter
	  Series          Bold
	  Size            Large
	  Shape                       SmallCaps
	  Color           Magenta
	EndFont
	LabelFont
	  Family          Typewriter
	  Series          Bold
	  Size            Large
	  Shape                       SmallCaps
	  Color           Magenta
	EndFont
	Preamble
		\newcommand{\lyxnewoverlay}[1]{
			 \lyxendslide{.}
			 \setcounter{slidetype}{2}
			 \begin{overlay}
		}
	EndPreamble
End


Style Note
	LatexType         Command
	LatexName         lyxnewnote
	KeepEmpty         1
	Margin            Static
	NextNoIndent      1
	ParSkip           0.4
	TopSep            1.0
	BottomSep         1.0
	ParSep            0.5
	Align             Left
	LabelType         Static
	LabelBottomSep    0.5
	LabelSep          xx
	LeftMargin        "New Note:xx"
	LabelString       "New Note:"
	Font
	  Family          Typewriter
	  Series          Bold
	  Size            Large
	  Shape                       Italic
	  Color           Magenta
	EndFont
	LabelFont
	  Family          Typewriter
	  Series          Bold
	  Size            Large
	  Shape                       Italic
	  Color           Magenta
	EndFont
	Preamble
		\newcommand{\lyxnewnote}[1]{
			 \lyxendslide{.}
			 \setcounter{slidetype}{3}
			 \begin{note}
		}
	EndPreamble
End


Style InvisibleText
	LatexType         Command
	LatexName         lyxinvisible
	KeepEmpty         1
	Margin            Static
	Align             Center
	LabelType         Static
	LabelString       "<Invisible Text Follows>"
	Font
	  Family          Roman
	  Size            Normal
	  Color           Cyan
	EndFont
	LabelFont
	  Family          Roman
	  Size            Normal
	  Color           Cyan
	EndFont
	Preamble
		\newcommand{\lyxinvisible}[1]{\invisible}
	EndPreamble
End


Style VisibleText
	LatexType         Command
	LatexName         lyxvisible
	KeepEmpty         1
	Margin            Static
	Align             Center
	LabelType         Static
	LabelString       "<Visible Text Follows>"
	Font
	  Family          Roman
	  Size            Normal
	  Color           Green
	EndFont
	LabelFont
	  Family          Roman
	  Size            Normal
	  Color           Green
	EndFont
	Preamble
		\newcommand{\lyxvisible}[1]{\visible}
	EndPreamble
End