https://gyazo.com/f7017a7ae1502323a9c5004209cfeab6
Hello, I know I can move the gui object, but I was wondering, as that’s gui core of Roblox, is it possible to move the setting icon, recolor it, or something? I was wondering, just for curiousity, but is it possible? 
All I know yet is
game:GetService("StarterGui"):SetCore("TopbarEnabled", false)
That’s the most similar of removing the whole topbar, I think
iirc it isn’t possible to get rid of the settings menu, but I looked it up and found something pretty close to what you’re looking for which is this : Hidable Topbar!
It hides the other aspects of the top bar such as the chat and backpack, but doesn’t hide the menu icon.
Hiding topbar is exactly what I made, I guess there’s no way to do it!
You can disable certain aspects of the Core GUI, such as the Leaderboard, Backpack, Chat Bar, Topbar (transparency), and then create your own 3rd party derivatives of these features which could be resized/moved to your desire.
The hamburger icon on the top left is a permanent fixture however, regardless of what aspects of the GUI you enable/disable.