1. Select a new piece or a wall in menu.
2. Click & hold the mouse over a square and then move your mouse over other squares.
3. Select the eraser piece (trash icon) in menu.
4. Click & hold the mouse over a square and then move your mouse over other squares.
Note that after click&holding the mouse you'll need to wait for a few milliseconds before you can move your mouse, in order to enter the "fill" mode. You will notice your cursor change once you enter that mode.
Hello I have been making a few custom variants recently and I have a question. Are there things that I can do to make it easier for example I would like to add a full rank of pawns is there a way to do that other than dragging each pawn over on its own or I would like to get rid of ever brick when I increase my board size is this possible or anything like this.