Remove the menu entirely, replace it with an avatar icon. Next to the avatar icon would be a red X button that would log you out.
Remove this feature, replace it with [username]'s icon on the bottom left to show that they are typing.
This feature does not work, so remove the button entirely.
Removal of Yourself
If the discussion is the Terraria Discussion or whatever you called the discussion with the terraria server’s chat, remove the - button next to your name. This causes less accidents with the discussion removal.
Online and DIscussions Tab
Add a button next to to the tabs that hides the tab. This will allow more room for you to see the chat horizantally.
Remove this button, most people on Phase only have 3 or 4 discussions.
This feature would allow you to easily search for users, instead of mindlessly scrolling trying to find the user you want. Productivity rules.
Notifications should be removed because notifications are often disruptive. Also remove the bell button.
Filters like by: should be more clear and should appear while you are searching.
These would improve Phase.