I don’t think you can actually do that as page designer, now as a mod through studio developper, for sure, basically calling the print button calls

"https://<domain>.ifs.cloud/main/ifsapplications/projection/v1/PrintDialog.svc/PrintDialogInit?odata-debug=json"

So it’s its own dialog that has its own projection, and does not belong to a particular page, which is why I don’t think it can be modified in page designer.