Bring whichever Discord Server you are currently in to the top of the sidebar, picture attached.

Currently, on the discord sidebar the discord server a user is currently in is displayed in the same place as when you set up your sidebar.

In the 1st screenshot below, which shows the current state, the discord server I am in is hidden within a folder that I have minimized.

In the 2nd screenshot, you'll see a proposed feature where the discord server that I am in is loaded into its own special slot. This is similar to the direct messages button in the top left corner 1st screenshot. 

Pictured below, you can see that the server is now highlighted and positioned at the top of the sidebar, in a special slot similar to the Direct messages button. If you look closely, you'll also see that the discord is still within the folder; it is simply more easily reached. 

I've spoken with quite a few people who think this would be a nice addition. That's all!