Before using this Registry tweak, you should backup Registry Editor. If something goes wrong, it can come in handy.
Change Search box text using Registry Editor
Here are the steps to change Search box text in Windows 10 from Type here to search to any other using Registry Editor: In this first step, you need to open Registry Editor. When the Registry Editor window is opened, navigate to the following key:
On the right-hand side, you will see a Value name String value, as visible in the above screenshot. Double-click on that value. You will see a box popup. There, the default text is visible in the Value data. Replace that default text with a text of your choice.
Once done, exit the Registry. Finally, you need to restart File Explorer. This will immediately apply the changes and you will see a new text in the Search box of Windows 10. You can repeat the above steps to get back the default text or add another text. Hope you like this trick.