Convert strokes to fills

To convert lines to fills, select a line or multiple lines and select Modify > Shape > Convert Lines To Fills. Selected lines are converted to filled shapes, which allows you to fill lines with gradients or to erase a portion of a line. Converting lines to fills can increase file size, but it can also speed up drawing for some animations.

Also, you can select the tool and choose Draw as fill in the Property inspector panel.

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