Here is the settings.conf

##############################################################################
#
# For support, visit http://www.retrofe.nl
# or visit irc.foreverchat.net (channel #retrofe)
#
# For Documentation, also visit http://www.retrofe.nl
#
##############################################################################

#######################################
# Display
#######################################
numScreens = 3
fullscreen0 = no # Full screen SDL applications often clash with the focus of other SDL applications
horizontal0 = stretch # or enter in the screen pixel width (i.e 1920)
vertical0 = stretch # or enter in the screen pixel width (i.e 1080)
screenNum0 = 0 # Screen numbers start at 0!

fullscreen1 = no # Full screen SDL applications often clash with the focus of other SDL applications
horizontal1 = stretch # or enter in the screen pixel width (i.e 1920)
vertical1 = stretch # or enter in the screen pixel width (i.e 1080)
screenNum1 = 1 # Screen numbers start at 0!

fullscreen2 = no # Full screen SDL applications often clash with the focus of other SDL applications
horizontal2 = stretch # or enter in the screen pixel width (i.e 1920)
vertical2 = stretch # or enter in the screen pixel width (i.e 1080)
screenNum2 = 2 # Screen numbers start at 0!

mirror0 = 0
rotation0 = 0

LEDBlinkyDirectory = C:\LEDBlinky
layout = Arcades
hideMouse = yes
showParenthesis = yes
showSquareBrackets = yes
collectionInputClear = yes
subsSplit = yes
cfwLetterSub = no
prevLetterSubToCurrent = yes
lastplayedSize = 50
lastPlayedSkipCollection = xSettings
cyclePlaylist = Playstation Portable,Xbox,Xbox 360,Game Boy Advance,Nintendo Entertainment System,Master System,Atari 2600,Amiga,Commodore 64,ZX Spectrum,Game and Watch,Pinball,PC Gamer,Arcades,Genesis,Super Nintendo,PC Engine,Nintendo 64,Dreamcast,Saturn,GameCube,Wii,Wii U,Nintendo Switch,Playstation 1,Playstation 2,Playstation 3

# specify the name of the first collection to load on start
firstCollection = Collector

# specify whether RetroFE should switch to favorites or lastplayed etc if it exists
firstPlaylist = Arcades

#######################################
# Video playback settings
#######################################

# set to “no” for very old/slow systems
videoEnable = yes

# Number of times to loop video playback (enter 0 to continuously loop)
videoLoop = 0

#######################################
# General
#######################################
# exit the frontend when the back button is pressed on the first page
# exitOnFirstPageBack = no

# enter 0 attract mode, otherwise enter the number of seconds to wait before enabling attract mode
attractModeTime = 19
attractModeNextTime = 19
attractModePlaylistTime = 120
attractModeSkipPlaylist = favorites
attractModeMinTime = 500
attractModeMaxTime = 1900

# remember the last highlighted menu when re-entering a menu
rememberMenu = yes

# Clear the input on entering/exiting a collection
collectionInputClear = yes

#######################################
# Base folders of media and ROM files
#######################################
# Override if you choose to have your media stored outside of RetroFE.
# If this is commented out your artwork will be searched in collections/<collectionname>/<imagetype>
# baseMediaPath=d:/media

# Override if you choose to have your ROMs stored outside of RetroFE.
# If this is commented out your roms will be searched in collections/<collectionname>/roms
# baseItemPath=d:/roms

2 Screens. As seen in the picture one 27 inch, and one 9 Inch display on the top.