Problem summary

When there are too many sprints in a board, the contextual menu is shifted beyond the displayable screen.

 Expected:

Unexpected:

Notice how the right-click menu is appearing off the screen. Without the ability to scroll the first sprints in the right-click menu are unreachable. If you drill down into the CSS we find that we're using:

element.style {
width: 200px;
position: absolute;

So this sets the menu to an absolute location, allowing it to expand beyond the visible area of the screen.

Workaround

It is possible to lower the top section to the middle of the page using

<style type="text/css">
    #gh-ctx-menu-trigger_drop {
		top:300px !important;
	}
</style>

You can set this in the announcement banner

another workaround is set the contextual menu to the whole screen:

<style type="text/css">
#gh-ctx-menu-trigger_drop{
top: 0 !important;
height: 100% !important;
overflow-y: scroll !important;
}
</style>