So today I found myself looking at my twitch dashboard being all messed up. They seem to have added a new panel called "Ad Manager" which then changed the default layout. Here is how to fix it by using these simple steps.
Step 1
Go to your dashboard and then click on the pencil icon located on the top left of the screen.
Step 2
In the new panel that pops up on the side called "Edit Stream Manager Layout", click on the reset to default button and then accept.
Once you accept the change to revert back to default layout, it should be how it was before today's change. You can also customize the layout by clicking the add button to the panels you want to add. Also can rearrange the location of the panels by holding your left mouse button on the title section of the panel and dragging it to where you want it.