Fully Kiosk newbie - issues

Setting up Fully Kiosk Browser on a Galaxy Tab A6. I want a dashboard called “Tablet Dashboard” to be available on this tablet using a non admin user “Tablet User”.

So far, I have managed to get this dashboard opening directly on the tablet. However, I am having no success with hide_sidebar. This is always available evn though I have tried many different code variations.

I am using the idea of a boolean Kiosk Mode to switch on and off and this is in the raw code.

A couple of attempts are below. The code is at the very top of the raw yaml.

kiosk_mode:
  non_admin_settings:
    kiosk: true
  admin_settings:
    ignore_entity_settings: true
  entity_settings:
    - entity:
        input_boolean.kiosk_mode: 'on'
      hide_sidebar: true
    - entity:
        input_boolean.kiosk_mode: 'off'
      hide_sidebar: false

kiosk_mode:
  user_settings:
    - users:
        - Tablet User
      hide_sidebar: true
      hide_header: true
      kiosk: true

I have tried without the boolean (as can be seen in the second example) but to no avail.

This is how the page appears on my laptop with my admin user:

I can access the Fully Kiosk tablet from my browser and this shows the settings:

plus a screenshot of the dashboard on the tablet

Also, just on extra question. Should hide_header hid the tabs? If so, that is not working either