Help with "Find in Files"

https://preview.redd.it/fkah3r29khng1.png?width=1260&format=png&auto=webp&s=18f5eb8e9c2ddb4040c4537729ddd53570f75bd7

This is a really basic question but--I'm trying to search by drug codes in the NAMCS dataset, but I changed the "Search in:" directory and somehow can't search within the dataset anymore. I tried setting it to search a bunch of different places: the actual location of the data, my entire computer, RStudio under Program Files, and I can't find it anymore. In the screenshot, I'm just testing the number "1" to see if any results at all show up. Help...