You can go back and open the returns in the version of TurboTax Online for the year you created them.
You can log into TurboTax Online 2022 here: https://ww1.2022.ca.turbotaxonline.intuit.com/
You can log into TurboTax Online 2021 here: https://ww1.2021.ca.turbotaxonline.intuit.com/
Previous years are not available anymore.
