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HDMI

The GRS Build a Cade can output to GRS Screen or HDMI Output
In the ES Retropie options menu HDMI changes screen output to Horizontal HDMI
In the ES Retropie options menu Build-A-Cade Screen changes screen output back to the Vertical Build A Cade Screen

Build-A-Cade_screen.sh VERTICAL
HDMI_screen.sh HORIZONTAL
sharec.sh SHARE CONTROLS BETWEEN MODES
nosharec.sh DO NOT SHARE CONTROLS BETWEEN MODES

/home/pi/

horizontal.sh
vertical.sh

#!/bin/bash

#set variable to current screen orientation
oldpos="horizontal"
curpos=$(cat "/home/pi/position.txt")

#if changing screen orientation
if [ "$oldpos" = "$curpos" ]; then

#backup current settings
  mv /opt/retropie/configs/all/emulationstation/es_settings.cfg /opt/retropie/configs/all/emulationstation/hes_settings.cfg
  mv /home/pi/RetroPie/splashscreens /home/pi/RetroPie/hsplashscreens
  mv /boot/config.txt /boot/hconfig.txt
  
#load vertical settings
  mv /opt/retropie/configs/all/emulationstation/ves_settings.cfg /opt/retropie/configs/all/emulationstation/es_settings.cfg
  mv /home/pi/RetroPie/vsplashscreens /home/pi/RetroPie/splashscreens
  mv /boot/vconfig.txt /boot/config.txt
  
#Change Retropie Menu for current screen setup
  mv /home/pi/RetroPie/retropiemenu/Build-A-Cade_screen.sh /home/pi/bac/Build-A-Cade_screen.sh
  mv /home/pi/bac/HDMI_screen.sh /home/pi/RetroPie/retropiemenu/HDMI_screen.sh 
  mv /home/pi/bac/change_background.sh /home/pi/RetroPie/retropiemenu/change_background.sh
  
#Update position.txt to current position
  sed -i 's/horizontal/vertical/g' /home/pi/position.txt

#Reboot the system
  reboot
fi

/boot/

config.txt

Vertical Specific Settings

display_rotate=3
hdmi_force_edid_audio=0
hdmi_ignore_edid_audio=1
ignore_lcd=0
display_default_lcd=1

Horizontal Specific Settings

display_rotate=0
hdmi_force_edid_audio=1
hdmi_ignore_edid_audio=0
ignore_lcd=1
display_default_lcd=0

Full Vertical config.txt

# For more options and information see
# http://rpf.io/configtxt
# Some settings may impact device functionality. See link above for details

# uncomment if you get no picture on HDMI for a default "safe" mode
#hdmi_safe=1

# uncomment this if your display has a black border of unused pixels visible
# and your display can output without overscan
#disable_overscan=1

# uncomment the following to adjust overscan. Use positive numbers if console
# goes off screen, and negative if there is too much border
#overscan_left=16
#overscan_right=16
#overscan_top=16
#overscan_bottom=16

# uncomment to force a console size. By default it will be display's size minus
# overscan.
#framebuffer_width=1280
#framebuffer_height=720

# uncomment if hdmi display is not detected and composite is being output
#hdmi_force_hotplug=1

# uncomment to force a specific HDMI mode (this will force VGA)
#hdmi_group=1
#hdmi_mode=1

# uncomment to force a HDMI mode rather than DVI. This can make audio work in
# DMT (computer monitor) modes
#hdmi_drive=2

# uncomment to increase signal to HDMI, if you have interference, blanking, or
# no display
#config_hdmi_boost=4

# uncomment for composite PAL
#sdtv_mode=2

#uncomment to overclock the arm. 700 MHz is the default.
#arm_freq=800

# Uncomment some or all of these to enable the optional hardware interfaces
#dtparam=i2c_arm=on
#dtparam=i2s=on
#dtparam=spi=on

# Uncomment this to enable infrared communication.
#dtoverlay=gpio-ir,gpio_pin=17
#dtoverlay=gpio-ir-tx,gpio_pin=18

# Additional overlays and parameters are documented /boot/overlays/README

# Enable audio (loads snd_bcm2835)
dtparam=audio=on

[pi4]
# Enable DRM VC4 V3D driver on top of the dispmanx display stack
dtoverlay=vc4-fkms-v3d
max_framebuffers=2

[all]
#dtoverlay=vc4-fkms-v3d
gpu_mem_256=128
gpu_mem_512=256
gpu_mem_1024=256
overscan_scale=1
disable_splash=1
display_rotate=3
hdmi_force_edid_audio=0
hdmi_ignore_edid_audio=1
ignore_lcd=0
display_default_lcd=1
dtoverlay=gpio-shutdown

overscan

In horiziontal Mode I see overscan_scale=1
This is making black borders on screen.
disable_overscan=1 is missing
https://retropie.org.uk/docs/Overscan/
I went in and uncommented
disable_overscan=1
While in Horizontal mode
confirmed hconfig.txt under /boot/ still has disable_overscan=1 unommented so should be good when switching back
Note in vertical Mode overscan seems to be used for some reason
Will leave it alone for that.