I wrote this in a different forum but here:
My mother is almost in the same situation, she does have visitor visa valid until 2022 but you need to leave canada after 6 months which would be June 5th . She can't fly backhoe or anywhere else at the moment due to the lockdowns and flight restrictions so the only choice I have is to apply for travel record so her stay can be extended.
I also strugled finding the right applications etc. but I finally figured out how to do it.
So you do need to have an online account on CIC - if you don't already have it register and log in and scroll down on the home page to Services and informations - there will be a list : My application , Immigrate and a few others. You need to click on Visit . from there you click - Stay in Canada longer .
It might send you back a few times , I think there is either a glitch in the system or they have some technical difficulties. So try different web browsers or different computers if you have, even your cellphone might work - it should guide you to a step where it asks you questions to create your online application for extending visa. Once you reach that step it will be saved and you'll be able to continue or access it from your personal cic account.
I thought I was going crazy today, since it wasn't just me experiencing this issues I'm sure they had some technical difficulties with the website.
Hope it helps and you're able to get to the online application.
Good luck!
