It doesn't say so in as many words, of course. According to the Google Ads & Commerce Blog (spotted by PCMag), it's a move meant for "improving navigation and introducing a new control." The new look groups all of the text-based links that are paid for into a single "Sponsored results" section, which can be collapsed by clicking or pressing a button. The new look is coming to Search on desktop and mobile, "currently rolling out globally."
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Choose from News Feed Directory Add Your Own Feed Create Feed Using Search Terms