I don't use orca slicer so I'm not familiar with how it works specifically, but are you sure that the retraction settings are actually changing between different sections? I made the mistake when I first started it just loading the model and letting it print with default settings from my slicer. If the GitHub doesn't specify exactly how to enable the retraction tower settings, I would look up a guide on YouTube. If you've done temp towers, it'll likely be set up in a similar fashion.
If your test starts at 0 and you don't see any difference, it definitely it not working as intended; 0 retraction with result in a huge stringy mess, and going to the next step will be a significant change.
Edit: also maybe make sure that you are using the correct values for testing according to your extruder setup; if you are using a direct drive retraction tower on a bowden setup, the changes will be too small to make any discernible difference, and the lowest setting on a bowden test will likely be too high for a direct drive.