The vetoing process on Quipuswap has been a source of concern for many users, as it allows a baker to be vetoed for doing no wrong. The issue with the old pools was that the governance design allowed any user with enough LP tokens to veto a baker, regardless of whether they had done anything wrong or not. This issue has been addressed in the new Dex 2.0 pools, as only admins can veto bakers. This ensures that only bakers who have violated the rules or acted in bad faith can be banned.
In order to know which pools are on the old Dex and which ones are on Dex 2.0, you can check the Quipuswap website. All of the active pools are listed on the Dex 2.0 page, so you can easily see which pools are on the new version. If you are unsure, you can also contact the Quipuswap team for more information.