Hi @veronika-mcaninch ,
OK now I understand your issue.
1 question though- Is the data on those collections (CFIA-CFII, CFIA, CFII, and CFIS_Dates) similar?
If the answer is yes- I’d recommend creating 1 collection for all of them and add a filter to the dataset on your page.
You can watch this video tutorial here: How to Use a Dataset - YouTube
Can this solve your problem?