Installed the Optimize app but I do not see any Croct field on my blocks

installed the Optimize app from the Storyblok app directory and I assumed a Croct field would just show up on every block automatically. it did not. the blocks look exactly the same as before.

what I already checked: the app is installed on the space, the space has a couple of published stories, and I reloaded the editor a few times. still nothing on the blocks. what step am I missing here