Hi Gavin,
Even though you have the 25H2, the feature will not be activated immediately as it is still in A/B testing. This means Microsoft is rolling out this feature to some while still retaining the old one to others to measure which performs better. If you want to activate it manually, you can check this method but I recommend you create a system restore point as backup.
Disclaimer: This is a non-Microsoft site. The information seems reliable, but be careful with ads. Research any product before downloading.