Hello,
You could put the number of point at 0, will that solve your problem? Use the right click menu, Edit Question, on the first tab you can decrement the points to 0. Or alternative: open Advanced Interaction (Project menu or F9), find the dummy question, put the number of points to 0, you could also deactivate 'Report' for this question. If you are using Default Question slides, and leave 'Show Progress' activated in the Quiz settings, the dummy question will be included in the total number of questions. Let me know if this is an issue?
Sorry, saw that this is the issue: you will have to deactivate 'Show Progress' in the Quiz Settings. If you want to show the total number of real Question slides, you can add your proper Text Caption to each slide. Do you use CP4? Hopefully, you can then define a user variable to calculate the correct slide number and one to calculate the total number of slides, by decrementing the corresponding system variables.
Lilybiri