Enabling condition box not visible

I’m trying to include an enabling condition, but in the question user-interface, the “Enabling condition” box is not visible/available (between “add interviewer instruction” and “Add new validation rule”). Would you have any advice on what I may be doing wrong? Thanks in advance!

You most like have these questions placed in the special section Cover Page.

As per linked documentation

Identifying questions (i.e. questions in the Cover Page Section) may not have enabling conditions. If a question with an enabling condition is copied and pasted into the cover section it loses the attached enabling condition.

If you move this question into a “regular” section, the enabling condition box should be visible again to you!