On the T4 slip entry page, how do I "select ‘yes’ to transferring employment income to form T777S in the applicable T4 slip." This error is preventing me from Netfiling.

I am getting a Netfile warning telling me to "Specify the employment income you want to claim employment expenses on for working at home due to COVID-19." When I click 'fix error', I end up on the T4 entry page, but I don't see any option to "select ‘yes’ to transferring employment income to form T777S in the applicable T4 slip." (at the bottom of the T4, I've answered yes to claiming work at home covid expenses for this T4).