I wish an option in mouse and touchpad preferences to Deactivate touchpad when a mouse is connected.
If you haven’t already tried it, I use Touchpad Indicator on one of my laptops. It has worked pretty well for me.
From terminal, this also does the job: gsettings set org.gnome.desktop.peripherals.touchpad send-events disabled-on-external-mouse
See https://askubuntu.com/a/787434/72216. It could/should be in Settings, but that is a Gnome issue.
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Thank you Jacob, the gsettings method worked fine for me