Multiverse Inventories issues

Hello, I am pretty new to this server stuff so sorry if this is a already answered questions I dont mean to be a burden, but I would like to ask how to connect my overworlds, nether worlds, and end worlds inventory all together just like normal minecraft, but I also have a hub world where new people spawn. and I don't want their inventories synced since we have had people abusing the block glitch with barrier blocks. If it's just a simple command I am sorry, but I haven't found much help on youtube or the spigot forums.
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