How to disable webui when alarm is armed!

Hi guys, I have Home Assistant installed on one RPi and tablet controlling all my zoo of devices. I have successfully integrated security on the overview tab, automated triggering alarm and flashing strobe. However one thing remained unclear - how to disable access to home assistant till alarm disarmed as tablet is installed at entrance permanently (24inch screen embedded into furniture)? Idealy I need alarm panel in front and all the rest blurred (like popup html modal window) till correct code is entered and no access through lan or cloud, all should show same screen - requiring access code - is it possible?

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You could use conditional cards to hide everything when it’s armed.

Thanks for reply, but how conditional card can hide everything?

You make all cards conditional except the alarm card

ok, that is another month of reconfiguring all 1500 cards I already created. What about other options then - left side panel with access to options, settings, supervisor panel and configurations?