Windows apps
The app catalog for PCs is not open yet. You can still enroll a PC, assign profiles, and send commands.
When to open this pageYou select the Windows tab in Apps & Books and want to know whether you can add an app.
Open Apps & Books, tab Windows. There is no Add app button on this tab.

Device settings (Wi-Fi, passcode, BitLocker) are done in Profiles. Android and iPhone apps are other tabs. They do not install on a PC.