In Notepad++ does not come with favorites, bookmarks or something like this for quick file access. For this you need use third-party favorite and bookmarks plugins like this:
- NppFavorites by heldersepu
All this favorite plugins you can easily find and install via built-in Plugin manager in Notepad++ in the following way: Main menu → Plugins → Plugins admin (or Plugins manager) → find and choose (turn checkbox near) needed plugin and press "Install" button → agree on restart program.
But be careful. After install any plugins Notepad++ may stop starting. In it case just delete catalog of installed earlier plugin (with all files) from Notepad++ plugins directory (default in Windows it: "C:\Program Files (x86)\Notepad++\plugins\").