Key menu
You will see the key menu after using the button 
or the keyboard shortcut <shift-F9>.
On the displayed circle of fifths the current key signature is preselected.
In the key menu, use the mouse or arrows to select what the new key should be and press [insert] (to change key at the cursor position) or [replace] (to replace the existing key (far) before the cursor position). to replace).
Note: Selecting a new key is not the same as transposition!
The check box for minor makes minor keys visible to choose from instead of major keys. For more information, see also theory.
The 7 flats check box shows the enharmonic_swapped (major) keys of D flat, G flat, and C flat instead of C sharp, F flat, and B (or in the case of minor B flat minor, E flat flat). minor and As minor instead of Ais minor, D minor and G sharp minor)