[grace-baker Hexnode 28 January 2020 grace-baker Moderator]

Hey, Thanks for reaching out to us.

Please navigate to Android->Restrictions. Select ‘Potrait’ from the drop-down list next to the Screen Orientation option.
The feature is supported on Generic Android, Samsung Knox, LG GATE, Kyocera business phones and on devices enrolled in Android Enterprise as device owner.

Kindly use the help link to know more about restrictions in Android devices.

Cheers!
Grace Baker
Hexnode MDM