Hello Jacob,
You can use the Export -> Export Tuned Blocks option in the Control System Designer to export tuned block values to MATLAB workspace. You can export selected models to the MATLAB workspace and use the rlocus(system) or rlocusplot(system) function, where system is the model exported to MATLAB previously to plot the root locus of the system. Now, you can save these figures as MATLAB figures with the extension, .fig.
If you want to save these root locus plot as images with formats .png, .jpg, .tiff, or .pdf click on the small arrow near the title of the root locus plot window and click on Save button.
