You can make individual changes to the graphical position of key signatures without affecting the positions of any other items.
Prerequisite
Note Spacing
is selected in the Engrave toolbox.
Procedure
Result
The key signature is moved graphically to the right/left.
When Graphic Editing
is selected in the Engrave toolbox, you can also change Spacing offset in the Key Signatures group of the Properties panel to move key signatures horizontally. However, this also affects global note spacing at the rhythmic position of the key signature, including moving cancellation naturals.
You can also move cancellation naturals graphically, independently of the subsequent key signature and without affecting the spacing of any other item using the Cancellation naturals X offset property.