In the 2.5 help (F1) there is no mention of "hide cancellations" in the "key signatures" tab.
The "find by category" doesn't include "spacer".
Not a big problem but... why not?
The help file will be updated to include missing info.
Not all object types are included in the predefined categories. You can find spacers using the expression:
|Spacer|*
Yes, I know.
That's why I wrote "Not a big problem".
But, as I wrote, why not?
I found myself using that query relatively frequently.