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ian(conker)
There is adjustment available for chain tensioning with the vertical drop.
Before sizing a new chain- you need to loosen (don’t remove!) these three screws, and wind out the grub screw (which I’ve pointed to but you can’t see. Repeat this on the other side too. Give the wheel a sharp kick and the whole thing should rock forward, pivoting on that top screw. When it’s as far forward as possible then you size the chain. tension by winding the grub screws back in evenly checking the wheel is staying centre.
Make sure these 6 screws are nice and tight before setting off because it will f you up if they’re not!
Lots of shops / people who aren’t familiar with these bikes don’t reset the wheel position when sizing the chain, so there literally isn’t enough adjustment to get good tension.