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How to make a part thinner

Hi,
I created this part by using the boolean subtraction operation. This part, Lid, was the target and a different part was used as the tool. The fitment is slightly too tight and I need to make the marked extrusion slightly thinner. I don't know the best way to do this so I created two offset sketches and tried to use the extrude tool to shave the part. The extrusion works, but 2 additional parts are created regardless of whether "Merge with all" is selected.
1. Is there an elegant way to slightly shave parts?
2. Why does the extrusion remove create 2 additional parts?


0
Answers
If you can share your document someone can take a look
If you want that part to be narrower you should just edit sketch3 and make it narrower... Or just use the "move face" as @GWS50 suggested (or add a clearance to your boolean)
Here is the CAD if you want to copy the modeling technique:
https://cad.onshape.com/documents/1cb6823e7f9cd5a4abab5faa/v/b071110563b323ab063b8511/e/cadad55b3e2062df53f03c46