Airtable apps are a Pro plan feature, letting you extend the functionality of your bases.
You can view your base's apps in a split screen view or a full screen view. To switch between them, click the expand button in the top right corner of the apps panel, or simply click to drag the dividing line left or right.
You can also expand an individual app to fill the whole screen by mousing over it and clicking the expand button.
To rearrange apps, mouse over the app you wish to move and click and drag using the drag handle in the top right corner. To resize an app, click and drag from the bottom right corner.
To add a new dashboard, navigate to the apps dashboard you're currently on. On the left of the dashboard, you'll see the name of your current dashboard. Click the down arrow to the right of the name, and select Add a dashboard.
To rename, duplicate, disable, move, or delete an app, click on the dropdown arrow next to the name of the app. You can also adjust the settings of the app in this menu.