Change of basic language pairs

Hi, Given the fact that a new Trados will come up soon (I have already purchased it) I want to know how I can change a not installed language pair. I have installed Spanish - German, English - German, Portuguese - German. Now I work more than one year with Dutch - German -- in MemoQ because this language is not installed in my Trados and I have no clue how to do that I want to know whether Iwith the new version I have to kick out Trados 2019 and install 2021 from the scratch or how can I remove Portuguese - German for example, that I do not use anymore and add Dutch - German. That is what I wanted to do log time already but ma installed MemoQ was closer than the Trdos support. But wit the new version I do not want to miss that opportunity. Thank you Peter