Customize the Office 365 App Launcher so it shows the Apps used by an user on a daily basis, it’s a task that can be accomplished easily by means of the Office 365 user interface:
From any Office 365 page, just click the App Launcher so you can see all the Apps pinned to the Launcher and also the “My apps” link. Click the “My apps” link.
In the “My apps” page, you can decide what Apps you want to pin / unpin in the Apps launcher by click the “…” link that appears next to each App
If we choose to add an app with the option to pin the App launcher, we shall see that the App has been added to Launcher.