You can add, delete, and edit web apps directly from the settings menu on your device.
Tap on the device's name in the top left and select Settings.
Go to Manage Web Apps. You can add a web app, but also edit or delete them.
The web apps configured on Control Hub or in the UI extension editor are visible in the web apps list under Externally Managed Web Apps, but it is not possible to edit or delete them from the device.