I don't think that's included with 5dims by default (that sounds like a bob's adjustable inserters thing, which is apparently force-enabled in the 5dim's modpack in case you are running that modpack)
But basically, everything 5dim's transport does conflicts with what More Long Inserters is trying to do. It adds 10 tiers of both standard and long-handed inserters (so no need for MLI compat to make long variants) and changes the menu sorting/grouping of the inserters (thus breaking the MLI compat that attempts to do the same thing with every other inserter mod apart from 5dim's)
I don't think there's any universe where 5dim's 10 tiers of inserters will look well with any other inserter mod (including MLI) since it already fills up all 10 slots per row, so I'd rather just not bother trying to make it work. I would need an entirely new sorting logic to make it work, and even then, I don't think it would look any better than just running 5dim's + other inserter mods, without MLI.