New config of ShopGui+, has a nice main menu, menus and shops! - three styles
With the bedwars style, I personally recommend creating the /shop command, which will open a category with blocks. (/shop -> /shop blocks)
The official configs fully support the stable version 1.21, all new items/blocks of things have been added.
If you found a bug, report it on PM, leave a review on how you liked my config :D