By the way:
As Tony proposed: Swap the scales.
It's a bit confusing for the respondent to see the media vertically first, and horizontally next
If you really want to do it this way, you may use Denis' plugin "hideEmptyColumn"
gitlab.com/SondagesPro/QuestionSettingsType
As X-scale subquestion you have to use
{if(Q_SQ001>1,Q_SQ001.question,"")}
{if(Q_SQ002>1,Q_SQ002.question,"")}
...
with
Q: Code of first question ("Frequency")
SQ001: subquestion code of this question
1: code of Answer "Do not use".
Q_SQ001.question: The question text of this subquestion.
www.limesurvey.org/manual/Expression_Man...#Access_to_variables
I use numerical codes, so it's easier to compare. If you still use "A1", "A2",... you have to say Q_SQ001!="A1"
Joffm