You have provided a score called “Dorico Prolude”.
There are some staves in this score that cannot be selected, such as trombones, clarinets, tubas, etc. Can you tell me why? Thanks.
You are looking at Page view with Condensing enabled. You cannot select or change things on those staves that are condensing (showing more than one instrument) when in Page view.
Change to Galley view (or disable condensing) and everything will be selectable.
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Thank you, Janus. It works.