I see the difference. You've selected Professional as the business type in the beginning of the Business section. Subcontractor fees don't appear on the T2125 for Professionals (T2125P). CRA only includes them on the T2125B (which comes up when you select I'm a Rideshare driver, freelancer, consultant, contractor or Other type of independent worker from the list in the opening of the Business section).
At this point, your best option is to include that expense in the "Other Expenses" spot - it's on the same screen as Office Supplies. Salaries & Wages is designed more for actual employees (with payroll deductions from you).
