For screen reader users, the "enable" checkbox comes after the date input and calendar picker. It would be a better experience if the "Enable" checkbox were to be put before the enabled/disabled fields, so that this is read before the rest of the date inputs and the user flow is maintained.

The issue may also occur to users who use a high level of magnification and don't have the whole input group in their viewport.

Steps to reproduce (using a screen reader):

• login as a teacher
• go to a course and add a new page module
• go to the "Activity Completion" section 
• note that the "Enable" option is read after the date
• uncheck the "Enable" checkbox
• navigate the same section again with the disabled date
• note that it is not clear wether the date is enabled
• enable the fields
• note how you must go back to set the date