[Solved]-highcharts - disable fading series on marker hover-Highcharts

You need to change the opacity property for a inactive state:

plotOptions: {
    series: {
        states: {
            inactive: {
                opacity: 1
            }
        }
    }
}

Live demo: http://jsfiddle.net/BlackLabel/wp46gdf7/

API Reference: https://api.highcharts.com/highcharts/series.column.states.inactive.opacity