I created a Custom Metadata Type with Public Visibility with Object Name "My_App_Settings".
On My_App_Settings, I added a Custom Field:
Field Label - "Enable Trigger"
Type - Checkbox
Field Manageability - Subscriber editable
Default Value - Unchecked
I created a new "My_App_Setting" with Master Label "Create Contact Trigger Enable" and selected "Enable Trigger" checkbox.
When I perform a SOQL query on "My_App_Settings" Object I see the row I created "Create Contact Trigger" but the checkbox is always set to false. I don't quite understand why this is the case. Does it have something to do with Subscriber editable setting on the Custom Field?