EuiResizableButton indicator works well when the height of the resizable panels fits in the browser window. But when it's not the case, the user has to scroll down (or accidentally over the border of the button) to get the idea that interaction is possible.

It'd be convenient to have a prop similar to the position in ModeOptions of the collapsible panel that allows putting the marker on top.

An alternative view mode for the EuiResizableButton would also work, for instance, the full-heigh (full-width) border.