No, ACCA is completely flexible. You can appear for any paper within the level in any sequence.
However the maximum number of papers you can appear for, in a single attempt is 4, but they can be attempted in any order.
For example, if you want to appear for the skill level exams in December, since law is held on demand, you can only appear for 4 out of 5 papers in December, and would have to postpone remaining papers to the next cycle. You would not be able to attempt all 5 in the December window. But which 4, is completely your choice.