Alright, well.. I tried a search on this and couldn't find any other topics, so curious if anyone else has this issue or a fix for it. Currently when I'm in my Inbox and try to delete messages, the dropdown menu will "hide" itself behind the rest of the page. Now.. if I have a lot of messages in my inbox (not sure how many.. but enough so the 'Selected Messages' button is at the bottom of your screen), then the menu will extend itself upwards instead of down, and I'm able to use it fine.
Here's an image of the issue in question: