Changing the stile to 'first author,year a or b' by more than one identical author

Hello,
I am using the stile 'Technische Universität Dresden - Medizin' in Germany.
I have a problem. I have quotes where the first two authors and the year are identical. So Zotero write the first THREE authors in the text to make a difference. But I want to change this just in 'first author, year, a or b'.

If there are more than 2 authors are identical Zotero change it automatically in the correct stile with 'first author, year, a or b'.

Can anyone help me please. I can't programing. I just find the button for the editor for the quotes (I don't know in English, sry).

Thanks everyone!
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