Is there a way to hide the deck editor in the pause menu
You can using another plugin that lets you change the contents of the Menu Window like YEP Main Menu Core to make this change. Otherwise you will need to edit the plugin to prevent the Command from being added to the Menu Window.
block isn't working, like it shows on the character but the enemies attacks seem to ignore the block
Have you checked the Damage Types associated with each Block State? Some Attacks will have Damage Types that will be mitigated by the Block State while others will go through. In the Demo Project, Attacks that deal Physical Damage are mitigated by Block (State 11) while Attacks that deal Magical Damage are mitigated by Ward (State 28).