I don't have my secure folder highlighted. But it still shows up. I recently switched to the S22 Ultra from the S10+ which I used the secure folder on that phone for notes and never had notifications.
If you press on Secure Folder text and then Details, there is an uninstall option in the More Settings area of the app.
Same problem here. My A32 with Android 12 was updated on Sept 17 and this Secure Folder locked notification problem started then. I've been using Secure Folder on this phone for over a year and it used to be completely invisible unless you wanted to use the app. Now it prompts to unlock the app after the phone is restarted and also randomly prompts several times a day to unlock the app. I just sat through several hours of Samsung tech support and the problem is not fixed. The last suggestion was to reset all app preferences on my phone to default settings and that's not happening. These notifications cannot be turned off and literally makes the app not secure.