your diagram
Subject of a cursory google. Yours is better.
From that, it looks like 2 should unscrew (maybe after loosening 4?) - maybe ask one of the plumbery types on the DIY thread about how to unscrew tight shiny chrome stuff without chewing it up.
#2 is held in place by the seating of #3, #4 and #5.
I've just gone at it with pliers - and I can neither damage the plastic nor budge it a millimetre 🤷
I can remove the whole hose easily though - so perhaps I should just replace #1.
@Velocio started
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Subject of a cursory google. Yours is better.
From that, it looks like 2 should unscrew (maybe after loosening 4?) - maybe ask one of the plumbery types on the DIY thread about how to unscrew tight shiny chrome stuff without chewing it up.