[Solved]-How do I make a same range-Highcharts

From my understanding, you need to manipulate the X & Y values in the Plotbands.

plotBands: [{ 
                     color: 'rgba(1, 143, 189, 1)',
                     from: 0,
                     to: 50
                 },

Check if this is what u needed.

For multiple plot bands with irregular intervals it is not possible to achieve equal area of color ranges.