Reading the documentation on Adjust Image, I don’t appear to have the option. I have beginner mode disabled.
LightBurn 0.9.20, built Sat 2020-12-19 @ 17:42
Ubuntu 20.04.2 LTS Release: 20.04
Here is a screen shot of the right click and the available options.
The image is selected and I right click, just like the docs say. Did I miss something somewhere?