Gnome terminal gnome-terminal
is quite... rigid and is not highly customizable.
As @synth-ruiner said, use kitty
instead. It is configurable up to... insane limits. Or without limits at all.
Kitty below has huge border margins, giant padding from borders to text, background image (it's not a fully transparent terminal window, it's an image inside the terminal), the font which Gnome terminal doesn't see and cannot use. Can't remember all settings that I changed in Kitty and which simply don't exist in Gnome terminal.
Set everything to your liking in Kitty: