deactivatating the automatic opening of the last session

how can I do that?
I read somewhere that I can do that in the opening dialoge, but how can I get there?
in wavelab8.5., mac

also: wavelab 8.5. is the least intuitive, most awful looking, and ridiculously tortuous program I have ever used. Even after many years of wavelab 6 and now 1-2 years of wavelab 8, I still wonder every time how it is possible all this could slip through any kind of quality control.

Hold down the Command key and continue to hold while starting Wavelab. That should give you the dialog.

thank you!