Inpainting allows you to regenerate only a piece of the image. By using an eraser, you can create holes in the image for the AI to fill, this gives you a great control of the art you are creating, as you can erase just the piece that is not exactly as you want, and ask AI to regenerate it.
To do Inpainting, first generate an image with the Generation Frame, then select the Inpainting Tool, click and drag to erase the parts of the image you want to replace. Now you can generate the image again, even changing the prompt to, for example, turn a dog into a cat:
