Forum How do I...?

Change the '?' that is added each time Prince does not find a glyph

Is it possible to use a symbol different from '?' for the cases when Prince does not find a glyph?
This is because it is sometimes difficult to locate the character with problems. If instead of '?' the system could add a square or another symbol, it would be easier to locate.
But I don't know if this is something I could customize on Prince.
Recent versions of Prince use ⯑ (U+2BD1).