First of all, welcome to the Homey Community!
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Hi Michael,
Both features, to hide devices and the alarm system with PIN code, are Fibaro HC build-in features.
Unfortunately, it is currently not possible to hide devices, but this is a frequently requested function. Contact Athom support and submit a feature request. The more users make a request, the greater is the chance that it will be added at some point, if technically possible.
As @Dijker already mentioned, Homey, and also the Fibaro HC3, are no real alarm systems.
But you can use the Heimdall App in combination with the Ring Alarm Keypad 2nd Gen (Ring Security App is needed). The Ring Alarm Keypad 2nd Gen is a Z-Wave device and the Alarm Base Station isn’t needed.
For further information, please visit the App forum topics: