At the bottom of the handle at the shroud, feel on the back of it, that may be the place for the grub screw, loosen that and the handle should pull off, then the shroud that should give you access to the ceramic valve.
Maybe not, wouldn't be the first I've come across handle that just pull off, if you absolutely can't see any grub screws either at the back or on the side of the handle then logic suggests they can only pull off
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