This is a demo tutorial. While there is no step-by-step commentary available (yet), the live demo below is fully functional. Feel free to open it for full source code.
This demo shows how we can use ValueAxis event "ready" to fix its scale (min and max values) on load so it does not change when chart is zoomed or scrolled.
See the Pen amCharts 4: Fixed ValueAxis scale by amCharts team (@amcharts) on CodePen.24419