Issue with Dark Mode and Theme Mode Switch

Hi, I am using the Rails version of Metronic8 and have followed all of the documentation to get the template up and running successfully. However, I am running into an issue where I cannot set the template to use 'Dark mode' by default, nor does the Theme Mode Switch button appear on the top navbar.

I have set the following attributes in the `settings.yml` file:
KT_THEME_MODE_DEFAULT: 'dark'
KT_THEME_MODE_SWITCH_ENABLED: true

Reviewing the compiled HTML via Chrome Dev Tools, I can see that the HTML attribute `data-bs-theme="light"` is set on the HTML element, as well as the cookie 'data-bs-theme' is set to 'light'.

I'm not sure if there is another place that I am supposed to be setting these values so any help would be appreciated.

Thank you!