How to delete a single key signature

Help me out here musicians, lol.
How to delete a single key signature from an instrument and keep the rest?

Thank!

Select that staff, then Shift-K, atonal, Alt-Enter. The Alt makes it independent to that staff only.

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Dan is quite right. But I should point out that this is not deleting a single key signature, rather it is setting a single instrument to a different key signature from the others. Every instrument always has a key (even if that is “atonal”)!

Unless you’re working with old fashioned horns, in which case there’s an option for it in the instrument picker, IIRC.

Likewise for timpani, which has a “No key sig” version in the instrument picker to cover this convention.

Thank you sir!!!