I just started to use XnView today (1.66 on Windows), and I have to say that this is really a great application

But there's one thing which confuses me. According to the help:
This means it should be possible to use the '+' and '-' keys to zoom in and out also in Slideshow mode. But this doesn't work for meAll the key combinations valid in the Image View mode, can also be used in Slide shows and Full screen mode.

In Slideshow mode the '+' and '-' keys are moving to next/previous image.
Am I missing something here?
Thanks,
Frank