First time doing this. Not sure what I did wrong.

I had the same issue when i did my first PR. You can find a file called autoformat.bat inside the Scottplot project folder, where you did your changes. Run this bat file, then it should fix the project file formatting. Do a commit, then push.
The autocheck on your PR will run automatically again, and hopefully it will pass the format checking now.

Not sure what I did wrong

bukkideme is correct! The project needs to be autoformatted.

dotnet format

I'll go ahead and run the autoformatter now then merge this pull request in. Thanks so much for adding this new feature @Neopentane1! 🚀

I updated the cookbook recipe too

double[,] data = ScottPlot.DataGen.SampleImageData();

var hm1 = plt.AddHeatmap(data, lockScales: false);
hm1.XMin = 0;

var hm2 = plt.AddHeatmap(data, lockScales: false);
hm2.XMin = 100;
hm2.FlipHorizontally = true;

var hm3 = plt.AddHeatmap(data, lockScales: false);
hm3.XMin = 200;
hm3.FlipVertically = true;

var hm4 = plt.AddHeatmap(data, lockScales: false);
hm4.XMin = 300;
hm4.FlipVertically = true;
hm4.FlipHorizontally = true;