If you are in mumble with a lot of people and have the overlay on it will take up the entire right side of your game screen. This is admittedly awful. Luckily there is a way to set your overlay to only show someone's name if they have their mic open. To do it, go to the overlay tab in Mumble Configuration. Under the Layout tab, there will be a big picture of the screen. Right click on the part of the screen where it shows the list of names. Under filter, select "Only Talking." Boom. Your overlay is now a lot neater and will only show people's names who are speaking. You can also adjust the size of the text to take up less space if you prefer. You may need to restart mumble and restart your game in order for the changes to take place.