Notepad++ v5.9.3 is available here:
2 new features added in this release.
To view the source code, in general, programers need more height space than width space. The vertical file swicher might be a remedy of the mainstream widescreen monitor. User can hide the tabs and manage the file swicher as sidebar. All of these are configurable in the preferences dialog (in General tab).
The Recent File List can be set in a submenu in this version and it is totally customizable. You can define your preference in Preference Dialog, under “New Document / Default Directory” tab.