Google Sitelinks Search Box Now Gone
Briefly

Google introduced the sitelinks search box over a decade ago but recently observed a decline in its usage, leading to its removal to streamline search results.
John Mueller noted that the actual removal of the sitelinks search box can sometimes take longer than anticipated, highlighting the complexity of these updates within Google Search.
The removal of the sitelinks search box does not impact rankings or other sitelinks, as Google aims to further simplify the user experience in search results.
Users are encouraged to either use internal search functionalities on websites or execute manual site queries after the removal of the sitelinks search box.
Read at Search Engine Roundtable
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