First, TurboTax cannot change your tax data - only you can change your private tax data.
Second, we cannot remove you from your ex's return, for the same reason - your ex has to do that.
Third, if your ex properly removed you as spouse, then that should remove all the information about you. I do wonder if your spouse kept you on as a dependent (that would be wrong) but we have no way of looking at anyone's private tax data to find out.
Fourth, if in previous years, your ex filed as Head of Household while you filed as Married, Joint in the same year (I can't tell from your post if this is likely), then be on the lookout for communications from the IRS, and respond quickly to the letter.
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