How do you remove the undo arrow?

I am using Harlowe 3.1 within Twine, and I am finding no results when searching for this. I find the undo arrow highly annoying while playing the game, and I wish to remove it. Any help?

To hide only the undo/redo buttons, you may use the following style rule: (goes in Story Stylesheet)

tw-sidebar .undo, tw-sidebar .redo {
	display: none;
}

To hide the entire sidebar, you may use the following style rule:

tw-sidebar {
	display: none;
}