Personally, if you do a lot of searching by file name I'd strongly suggest at some point that you download and install Search Everything from voidtools.com.
But, it's a simple matter to use Windows search as well. For instance, if you know you want to search only your C: drive and are looking for something that starts with the name "Tom" and has a plain text (txt) file extension, after hitting the Windows Key, or hopping into the search box, enter:
The drive letter designation is only necessary if you have multiple indexed drives and want to limit the search to one of them. Otherwise, all indexed drives will be searched.
Brian - Windows 10 Pro, 64-Bit, Version 20H2, Build 19042
One does not discover new lands without consenting to lose sight of the shore for a very long time.
~ André Gide