"Set to width of window" for tables doesn't work (at least in webapp)

[100WattWalrus 1]

I assume when using "Set to width of window" for a table, that means the table with vary in width depending on the window size, but that doesn't happen.

When I use "Expand Note" (which, by the way, needs a keyboard shortcut in the webapp) to focus on the note, all the text and horizontal rules change to the width of the window, but the tables stay the same.

If "Set to width of window" isn't supposed to make the tables variable width like the rest of the content, what does it do?

I use a single-row/single-column tables as color-band headers, so I need them to vary width just like the rest of the content when I change my window size.