We used Power Apps, Power Automate, Microsoft Cognitive Services and SharePoint to create a visitor registration app with facial recognition capability 

PowerApps are all about collections.   

We have taken to pulling multiple SharePoint lists into a single collection. We then display and manipulate a single collection within our PowerApp.

Collapsible navigation menu built in Power Apps using flexible height nested galleries. Flyout animation is achieved using a timer to dynamically change the horizontal position.

Accessing Power Apps from SharePoint pages is easily achieved using the Embed Web Part.

Presently there is no way of preventing users selecting future dates using the properties of the PowerApps date picker control. Fortunately we can overcome this limitation using a simple formula.

Speed is crucial in ensuring good user experience in our Power Apps. Waiting for Power Apps and screens to load can be frustrating for users.  This article discusses strategies for making our PowerApps more efficient, and faster to load.