Yes, content marked as 'Optional' will still cause users to become marked as uncompliant if it is incomplete.

The feature to set a course as 'Optional' is primarily meant to be used to help users prioritise content. It is useful functionality when there are multiple pieces of content targeted to the same group within a close time frame, as it will let users know which courses they need to complete immediately.

However, the overall process is that any course that a user is targeted to on the platform will need to be completed. Therefore, it is important that users are made aware that, although the course is marked as 'Optional', that they will still need to complete all content that has been assigned to them.