I think you are referencing the ‘Cut Optimization’ button in the ‘Laser’ window. As Oz said, this button is one that gets hidden when you set the ‘Beginner Mode’. Beginner Mode is used to hide some of the more advanced features and options. Here is mine, set both ways, so you can see the difference.
My current setting,
And after I click the ‘Gears’ icon, near the top-center, to expose the ‘Settings’ window and set ‘Beginner Mode’ ON (green),
And this image shows how this change alters the view, hiding the ‘Cut Optimization’ along with other advanced options in LightBurn.
Turn ‘Beginner Mode’ OFF (red) to see this ‘Cut Optimization’.