If you know a submenu is going to open to the left, which way should the arrow point?

I have a menu dropdown with submenus. I know based on screen sizes that about 70% of the time the submenu will show up to the left of the main menu (as the edge of the screen prevents it opening to the right). The other 30% of the time, it's on the right. Which way should my "there's more options here" arrow point?

Obviously with the current direction it's ambiguous - the arrow points right but the menu opens to the left.

I could leave it and say it's fine for 30% of users, but that seems unideal. I could have the arrow point left instead, but that reads weirdly to me to see Label <. Likewise, having the arrow point down when the menu isn't intended to accordion into the new options is also weird.

Is there any consensus in cases like these?