Removing Free Trial from active subscription plan

Hello,

In my game, I have a subscription already published, where I have set a 30-day free trial for everyone who has bought it. I'm updating the way my subscription plans work and I'd like to remove this free trial from the subscription, but I don't know how this will affect players who have already signed up and are in the free trial period.

Will they continue with the 30-day free trial until the end of the term?

Will the subscription automatically remove the free trial period and charge them?

Thanks in advance!