Where in Lightburn (latest version) can I make adjustment for kerf?
In the Cut Settings Editor window. Double-click on a Layer in the Cuts / Layers window.
In addition to @MikeyH’s suggestion for the per-layer kerf settings, you can directly resize specific shapes using the Offset tool.
Figuring out which way the layer kerf offset applies to holes / slots / tabs can be baffling, which is why I usually resize the shapes using the Offset tool. I keep a copy of the original shape off to the side so I can re-do the adjustments in the unlikely event I re-do the project with a different material.
Selecting an absurdly large kerf makes stupid mistakes clearly visible when you use the Preview window to verify the settings.
Been there, done that: Undo is my copilot. 
More in addition, check out the 4 links
After a lot of thrashing around looking for the place you mentioned I finally found I had beginner mode selected for the Cut editor window. Turning that off made it much more obvious!
Thanks ednisley, good thing to know about also.
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