Is there a way to hide the deck editor in the pause menu and block isn't working, like it shows on the character but the enemies attacks seem to ignore the block

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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).
Yes, the default behavior for CGC Core Engine is the StS format you have outlined if you turn off Deck Editor. If you would like to keep Deck Editor but restrict the number of Decks, you can do so by removing the Command Options Equip, New, Copy and Delete. That way you can still use the Editor interface but disallow players from making more than one Deck. We will have an option to skip the Deck Selector scene and go directly to the Deck Edit Scene in a future update of Deck Editor.