If you separated or divorced in 2018, the CRA will still
require your spouse’s information.
If you separated or divorced before 2018, you say
"No" to the question "Did you separate from your spouse/partner
in 2018?".
To make changes, select “Marital Status” from under
“Setting Up/Introduction” in the left side menu. Choose the correct options and
click the “Continue” button to save your information.
If you can’t see “Setting Up” (or there are locks next to
everything), use the “Back” button at the bottom of the page to go backwards
through the interview until you get to the “What's your marital status?” page.
I’m separated or divorced. Why am I being asked for info
about my former spouse/partner? https://turbotax.community.intuit.ca/replies/3425400
What to do if you don’t know your (ex)spouse’s income?
https://turbotax.community.intuit.ca/replies/2647950