This lab does exactly as the name suggests - it moves your Hangouts list to the right of the screen. This not only makes your chat list visible at all times, it also gives more room for your label list.
Here’s the difference:
Hangouts in the default location
Hangouts in the right-side location
As you can see, the right-side location provides a much cleaner and clear division of the screen.
To enable Right-side chat1. Click the Settings cog button > Settings.
2. Select the Labs tab.
3. Find and enable the Right-side chat lab.
4. Click Save.
Note: This lab works with both the old style chat and the new look Hangouts.