Hi @Anonymous ,
Sorry, I'm not very clear if you want to export the data from the dataverse or the data from collections to CSV.
If you want to export the CSV when the form is submitted, you can try connecting Powerapps to PowerAutomate.
Since you did not provide a data source, here I use collection to make a simple demo.
Collection contents are as follows.

Create a Flow with the content shown in the picture:

Connect Canvas and Flow, add Button to Canvas and set as follows:

Collect(ExportCSVCol,{CNO:18,CNAME:"C"},{CNO:19,CNAME:"A"},{CNO:20,CNAME:"C"},{CNO:21,CNAME:"D"},{CNO:22,CNAME:"C"});
Set(
ExportCSVVar,
Concat(
ExportCSVCol,
CNO & "," & CNAME & Char(10)
)
);
'PowerApp->Createfile'.Run(ExportCSVVar);
After running the app, a CSV file will be created in OneDrive, which can be opened and viewed in Excel:

If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.
Best Regards,
Wearsky