On the leak version of Windows 10 (build 9901), you no longer have to force the search box to appear in the taskbar, which is also part of the Cortana integration. The default text reads “Search the Web and Windows” and even though there is nothing wrong with the wording, there is a registry tweak you can make to change the default text in the search box.
By any means this tweak makes you more productive, but it’s just about the knowing that you can do it and you can have a more unique desktop. Follow the steps below to make it all work.
How to change Cortana default search box text
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Open the Start menu, do a search for regedit, press Enter and launch Registry as an administrator.
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Browse the following path:
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Search
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Right-click on an empty space, select New, String Value, and name it SearchEditBoxText.
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Double-click SearchEditBoxText and enter the text you want to appear in the search box. For example, “Search with Cortana”.
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Here is the before settings:
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And after the tweak we made:
The previous step is all you have to do, now restart your computer and sign back in to see taskbar with a search box including custom text. To revert the changes, simply go back to the registry path on step 2 and delete the SearchEditBoxText String Value you created.
Source @Whistler4Ever