It only updates once you select another item From dark to light theme:

How can I animate switching from dark to light theme (without using animate on every single color on the theme)

I don't think there's a way to do that yet. Without knowing how you use it, I'd say it's more efficient to animate the color as you read it out from the theme than animating everything defined in the theme. But I'm curious whether this question is motivated by also animating the implicit theme color reads from material components.

I change it via https://github.com/alorma/Compose-Debug-Drawer

No @Doris Liu, as using a transition, it gets updated once per frame, it not animate each color on different steps, it's a single animation