Hi Vibe,
I have enabled the switch and following tutorials i created buy batch page with unlimited using 0. but the selection for courses is not loading.
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This is because you have not set the price per seat for the courses.
Please go through the tutorial again, its clearly mentioned that you need to set the price per seat in the course settings and only the courses whose price per seat is set are shown in the select courses option on the buy batch shortcode.
Setting the buy batch to 0 means that after purchasing the batch you can add unlimited courses in the batch from the batch settings.