Under usual circumstances, the key signature for a staff appears only at the beginning of each line, or at a key change. If you want, however, you can hide the courtesy key signature that appears at the end of a staff system (when the key changes at the beginning of the next line).
To hide the end-of-line courtesy key change
When a key change occurs at the end of a line of music, it’s customary to display the new key signature at the very end of the system, as well as at the beginning of the following system. This end-of-the-line key signature is sometimes known as a cautionary, or courtesy, key signature.
Some musicians prefer to omit this end-of-line warning and let the key change (on the next line) stand on its own.
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