You can see your HRV levels throughout the day by looking at the HRV bar chart in your Lief app. Each colored bar represents your average HRV during that 5 minute period. The colored bars show whether your HRV was relatively lower (red/yellow) or higher (green/light blue/blue) during that 5 minute period. You can scroll back through this chart to see your HRV data from previous days.
You can also select the "Progress" button on the home screen of the Lief app to see your aggregate HRV data on a weekly basis.