Started Jan 2025 - Setting Tax Year for the 3 Months?

Basically doing working from home expenses, using the simplified rules which is max £26 per month.

When i enter the hours in Tax Profile its automatically calculating for the full 12 calendar months = £312

My start date is Jan 2024 so can only claim for the 3 months @ £26 which should = £78

How do i rectify this?