In the mean time I've made another test an now it's working fine: I've added an additional filter with "Page type" not equal to "Front page".
With this additional filter now the popup will not show on the home page.
Thanks for your help
If I can suggest another thing: it's not possible to delete the filter but only add. If you add a filter by mistake you need to delete and recreate the popup. I think that a delete button will be very useful.
Very good plugin, before I was using one for the bottom right box triggered by scroll percentage and one for the central popup, with this one I can use just one plugin for both!
Have a nice day