In Settings - Navigation - Route re-calculation, change the value of "Distance for recalculation" to something different than the default value 100m, e.g. 50m:
As long as Locus stays open the new value will be kept.
But as soon you restart Locus the default value of 100m is shown instead of the changed value.
As long as Locus stays open the new value will be kept.
But as soon you restart Locus the default value of 100m is shown instead of the changed value.