I also applied for my TRV after PGWP approval and got the same details to be filled. The visit duration would be from current date to your PGWP expiry date. You can share your employer details if you are working or just share your friend details.Hi Sara,
I have a feeling you might have ticked off the wrong box, instead of applying visitor visa from inside Canada, you might be filling the form required by people visiting from outside Canada. I would recommend checking your questionnaire again and check the application form again!
Hope this helps!