Hi spk!
We appreciate you reaching out to us!
Yes, you can set min and max on axes to constant values, which will discard outliers. Below you can find a very simple demo with min/max on yAxis.
Demo: https://jsfiddle.net/BlackLabel/n902dctb/
API Reference: https://api.highcharts.com/highcharts/yAxis.min
https://api.highcharts.com/highcharts/yAxis.max
Feel free to ask any further questions.
Regards!