It looks like Google has recently redesigned its desktop search page to display more important information to you by removing its sidebar. Available immediately, do a search on Google.com now and you’ll see that the sidebar that used to be on the left has been removed. Instead of using a whole area just for some options, the new extra space is now being used to deliver more information such as features like the Knowledge Graph.
The search options have not been removed completely of course, instead, all advanced search tools have been moved to the top of the results so yes, you can still filter your search results like you’ve been doing all the while. All you need to do is click on “More” or “Search tools” and you’ll get a drop-down-menu displaying all those options.
It’s not a major haul over, the new interface just gives a cleaner design that delivers a consistent search experience across the wide variety of devices and screen size used today. The new minimalistic design was delivered to tablets last year followed by mobile phones a few weeks ago and now, it’s finally available on the desktop version.