I still don't understand how search just can't file files with the string I write in the search bar on the name. Or menu items either.

Some file browsers on Linux have this problem too, and the KDE launcher had it for years (it's fixed now).

For a look into a parallel universe of what could be, check out Everything[0]. Super fast search that should be embarrassing for Microsoft.

[0] https://en.wikipedia.org/wiki/Everything_(software)