The way the Gnome terminal settings are configured is kind of interesting. When the installation first boots up, this script is run: etc/skel/.config/autostart-scripts/dconf.sh · master · Garuda Linux / Themes and Settings / Settings / garuda-gnome-settings · GitLab
#!/bin/sh
dconf load / < ~/.config/garuda-dconf.ini
rm -f ~/.config/garuda-dconf.ini ~/.config/autostart-scripts/dconf.sh &
notify-send "GNOME settings applied! 🔥"
It sets the inital configuration with that garuda-dconf.ini file, then deletes the file and deletes itself. Like a self-destructing setup script. 
This is the garuda-dconf.ini file it uses for configuring the settings: etc/skel/.config/garuda-dconf.ini · master · Garuda Linux / Themes and Settings / Settings / garuda-gnome-settings · GitLab
You can load the dconf file again by saving it somewhere on your computer, then run the command:
dconf load / < /path/to/dconf.ini
If you just want the terminal settings, that is this part of the file:
[org/gnome/terminal/legacy/profiles:/:b1dcc9dd-5262-4d8d-a863-c897e6d979b9]
background-color='rgb(46,52,54)'
bold-is-bright=true
cursor-shape='underline'
custom-command='/bin/fish'
default-size-columns=110
default-size-rows=30
font='FiraCode Nerd Font Mono 12'
foreground-color='rgb(211,215,207)'
palette=['rgb(46,52,54)', 'rgb(204,0,0)', 'rgb(78,154,6)', 'rgb(196,160,0)', 'rgb(52,101,164)', 'rgb(117,80,123)', 'rgb(6,152,154)', 'rgb(211,215,207)', 'rgb(85,87,83)', 'rgb(239,41,41)', 'rgb(138,226,52)', 'rgb(252,233,79)', 'rgb(114,159,207)', 'rgb(173,127,168)', 'rgb(52,226,226)', 'rgb(238,238,236)']
use-system-font=false
use-theme-colors=true
rewrap-on-resize=true
use-custom-command=true
visible-name='Garuda'
Copy and paste it into a file on your computer, then use the dconf load command above and it will restore the original settings of the terminal.