Draw over other apps permission is required to show floating window over other apps. Grant permission on first start. Or grant it manually from android permission settings.
Using float mode
In floating mode a bubble widget appears on screen. Click bubble to open credential list. Click credential to see detail view. Long click to copy field values (If copy enabled in settings). Single click to toggle masked fields.
Switching to full mode
Open app from launcher icon or from notification to switch to full mode.
Closing app from float mode
Drag and drop floating widget over trash widget at bottom of screen exits the app.