You can choose the presentations that need to be shown in the key bar at the left side of the app. That way users can open this publication immediately from the home page.
Login to the Portfolio Manager > open your 'Content' > click on 'Open settings' in the details of the publication:
In the third tab 'Advanced', you can activate the slider to mark it a key publication:
After activating this setting, the publication will now be visible in the key bar of the app for all users: