Google has recently updated Google+ with 41 new features. This major update includes a revamp of the web UI that is now responsive and displays the posts in multi-column format.
The good news is that Google has also provided the option of switching back to single-column view for those G+ users who prefer viewing their stream in single-column format.
In Google+, select the Home stream button. In the top menubar, look for ‘More’ drop-down menu; select it and click the single column layout icon.
This option, however, only changes the format of posts in Home Stream. If you also want to see the posts in ‘What’s Hot’ and Communities in single-column, then go to Account Settings -> Google + and select the Accessibility checkbox as shown below:
Enjoy the uncluttered and headache-free single-column layout of Google+ posts!