alignThresholds property
When using multiple axes, align the thresholds. When this is true, other ticks will also be aligned.
Note that for line series and some other series types, the threshold
option is set to null by default. This will in turn cause their y-axis
to not have a threshold. In order to avoid that, set the series
threshold to 0 or another number.
If startOnTick or endOnTick in the axis options are set to false, or
if the axis is logarithmic, the threshold will not be aligned.
API Docs: https://api.highcharts.com/highcharts/chart.alignThresholds
Implementation
bool? alignThresholds;