Metrics can be viewed at the account level and at the app level.
Account Level Metrics
Tap the "Metrics Tab" in the top tab line and see a dashboard such as is shown below. It displays app, page view, and tap activity for the entire account.
"CTR" is the click-through ratio.
Unique visitors reflects a unique device/browser combination. Thus is a user accesses an app on their phone from the Safari browser and then accesses the came app from Chrome on the same phone, these two interactions will be recorded as 2 unique visitors.
Engagement by "browser" versus "installed" is a metric that tracks if your users are using your app (i.e. progressive web app) as a website, or if they have installed it on their phone and are using it as a an app.
Also see your top performing apps and your top performing actions. Remember that one action can be used in multiple apps, so when viewed from the account level, you are looking at total interactions for that action. (The App level metrics will only show actins interactions for that single app).
App Level Metrics
Tap the "Metrics Tab" in the app navigation bar to see app level metrics. They are similar to the account metrics, but they only apply to a single app.
For an app, the action list is very useful to see which content in the app is engaging users to tap the action.