How do I switch on Device Encryption under Windows 10 Home?

Device encryption requires device support of a TPM 2.0 chipset and InstantGo.

Further details can be found via Microsoft's Windows 10 Specifications: http://www.microsoft.com/en-us/windows/windows-10-specifications

If your device does support TPM and InstantGo (Connected Standby), you can enable the option on the Modern UI System, About screen.

Scroll down on the right hand side pane, and there's a section for Device Encryption.

An additional limitation is that in Windows 10 Home (which most of the smaller tablets that have InstantGo have) you can't enable drive encryption's PIN security (which requires gpedit), so whilst the drive is encrypted, it doesn't prevent anyone starting the device and just getting in if you either have a missing or weak windows login.