Anybody know what this warning means and how I can get rid of it?

[DrKittyWaffles]

No. You can’t do much about it.

This is the new top bar throwing a warning though.

New In-Game Topbar

Hello Developers, As part of our ongoing effort to modernize the design and improve the functionality of the in-game UI, we are excited to introduce a NEW topbar for PC, Mac and all mobile devices! This topbar is more lightweight than the existing one, so the visuals of your game can shine through! To save space, we moved most of the icons to a new Game Context Menu on the right side. As you can see below, when you open this Menu, you’ll have access to the Leaderboard / Player List, Emotes and …

This is going to be fixed soon however:

@TheGamer101

We have a fix for these two bugs coming out soon.