Its helps to think of the "Wind Optimizer" and "Wind Correction Angle" as separate features. If you a use a departure TIME more than 24hrs in advance or open a old flight plan, the Wind Speed & Direction is absent from the NavLog. Just adjust the TIME (blue text top left) to within 24hrs to refresh WCA calculation.
Wind Optimizer chooses the best Altitude based on Winds Aloft table. When creating a plan, tap on the More button/text to enable or disable this feature. For existing plans, once your on the NavLog screen, select Winds Optimize button to update.