On this official Highcharts demo https://www.highcharts.com/demo/gantt/with-navigation
the display starts at the end

What do I need to change, so the navigation range starts at the beginning like so?

On this official Highcharts demo https://www.highcharts.com/demo/gantt/with-navigation
the display starts at the end

What do I need to change, so the navigation range starts at the beginning like so?

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You can use
setExtremesmethod inloadevent:Live demo: https://jsfiddle.net/BlackLabel/8tk52zdw/
API Reference: https://api.highcharts.com/class-reference/Highcharts.Axis#setExtremes