Flood fill can't turn on

I have not played with my laser in about a year was lucky enough to get a CNC router but now i’m try to combine both want to burn some cutting board by request, but it will not let me turn on the flood fill toggle to save time have to run at 3000 MPM to get under 2 hours any help would be great Tia halftimer

Show a screenshot of the LightBurn window and the layer settings.


does this help your dealing with a old man

You cannot flood fill with an ‘offset fill’ mode layer - only a ‘fill’ layer. If you change your Mode, that box will become usable.

For reference:

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