Sibelius beginners can discuss all things Sibelius here ("how do I...?").
Re: Deleting staves
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Select the whole of the bass staff (triple click it) and then press [ctrl/cmd][shift][alt/opt]h (Hide empty staves)
Sib 6.2, 7.5 and 2019.9, Windows 10, 32GB RAM, 8TB 7200RPM Storage, 2TB SSD Note Performer 3, EWQLSO, EWQLSC, Harmony Assistant and some others.