App Preferences allows you to set default in-app settings for all users, which will be applied automatically when they start using Canary. Select ‘Enforce’ if you would like to disallow changing that specific setting.
If you enable ‘Enforce’ for any setting, the user will not be able to change that setting. The setting will either appear disabled on device, or they’ll see an alert saying that the administrator controls this setting.
For example, if you've enabled Enforce for 'Remote Content' setting, it will appear disabled on the user's device, as shown below.