In the feat/flyout-system feature branch (currently not yet merged to EUI main), the logic to support the responsive rules of fill mode, specifically when there is a child flyout visible, no longer works.

The rules are:

1. A standalone flyout using "fill-mode" should use a width of 90vw
2. If there is a sibling flyout, the flyout in "fill-mode" should use a width of calc(90vw - widthOfSibling)
3. The width of the flyout should stay up-to-date as the screen width changes
4. Logic around maxWidth prop applies as well.

Update: it appears this was introduced in #8999, and all flyout size configurations are affected. The flyout with is no longer proportional to the size of the screen.

Before

After