Presently the right axis is measured on every render to estimate how large the ticks are and that space is allocated by the layout manager. However, plots with no plottables using the right axis shouldn't be keeping that space open. It's causing issues when adding additional axes or colorbars because there is a lot of space occupied by that unused axis. #3294

Current behavior

double[,] data = SampleData.MonaLisa();
var hm1 = myPlot.Add.Heatmap(data);
hm1.Colormap = new ScottPlot.Colormaps.Turbo();
myPlot.Add.ColorBar(hm1);

This hack works for now

myPlot.Axes.Right.MaximumSize = 5;