I was working on editing one of my sprites in the “Vector mode” setting on the ‘Costumes’ tab. I realized that I could fill inside an area in “Bitmap mode”, but not in “Vector mode”. Can this be fixed?

In order to fill something in vector, the lines need to be snapped together rather than just next to each other- this is due to how vector works.

With some sprites this may be difficult, but thank you for your instruction.

If you'd like fill in disconnected lines in the vector editor, you can create a filled-in “effect” by placing down a circle, reshaping it into the lines, and sending it back a few layers until the lines are in front of it. If done right, it should look like you filled it in, despite technically just being another shape.