Shotcut: Saving Custom Export settings

I export my fullscreen videos with a resolution of 480x360, how do I save this as a custom export setting?
(see attached image)
Saving as an MLT file doesn't do it.

I've asked on Reddit without any answers yet:

https://www.reddit.com/r/shotcut/com...port_settings/
Just in case there's a response see above.

But I have more hope with LQ - usually good at providing advice - cheers folks
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