Fill too thick, how can I make it thin and straight

I am using the fill tool to make my line permanent and it is way too thick. I cannot figure out how to make it one simple straight thin line. Kindly assist

Hi
@Constance_Sentongo
You will find the instructions for use here:

19.14 ![figure images/tools/Switcher.png]

(https://imagej.nih.gov/ij/docs/guide/images/tools/Switcher.png) ![figure images/tools/Brush1.png]
(https://imagej.nih.gov/ij/docs/guide/images/tools/Brush1.png) Brush

19.18 figure images/tools/Switcher.png figure images/tools/Brush2.png Overlay Brush

We remain available if necessary …
Have a good day

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