@Peetam You'll see it on Line 23500 – Social benefits repayment. You can see Line 23500 on your detailed tax summary.
To see a detailed summary of your return using TurboTax Online, click the first arrow below your estimated refund amount in the side panel, then select the option for View detailed tax summary. The Detailed Summary page will appear, giving you line-by-line information regarding your income and credits.