Work on Minecraft version 1.21.120 or less !! (Not work this update 1.26)
EZ Menu

Add dynamic in-game Menus to your world with this Behavior Pack! No programming required — any one have admin tag can create/edit/manage menus easily for all players.

Guide how to use Modpack (Minecraft bedrock)

- Any player with "admin" tag is considered an admin and can create/edit menus

(you can get tag with:/tag @s add admin)
- Store menus in world properties (dynamic property) -> persist after world restart
- Available commands via /scriptevent:
    /scriptevent menu:create   -> Opens UI to create a new menu (admin tag only)
    /scriptevent menu:add      -> add button to existing menu (admin tag only)
    /scriptevent menu:open <menu_name> -> Opens menu for any player by menu name <menu_name>
    /scriptevent menu:manage   -> Manage menus (delete buttons) (admin tag only)
    /scriptevent menu:list     -> Show all available menus
    /scriptevent menu:delete   -> Delete entire menu (admin tag only)

Video to example