Go to Students > Examinations > Scheduling > Allocate Exam Room. Select the exam.
You will see a tick box to Include Centre Assessed assessables. This includes exams that can take place at any time, such as an Art practical exam, or coursework.
If you tick this box, then click Apply, any clashes between Centre Assessed assessables and other exams will show. If you untick it, the clashes won't show. This box is unticked by default.
If you then have any clashes you would like to resolve, follow the instructions in this article.