In Pandle the set categories created when you set up your account cannot be edited or deleted.
Although this restriction may seem limiting, we took this decision in anticipation of machine learning and AI work we will be completing in Pandle. We believe this work will significantly reduce the scope for user error, but in order to identify potential errors and alert users we need to know what the categories are. So if we allowed users to edit/delete set categories then this work would not be possible.
To take advantage of ML and AI in Pandle we recommend using standard categories where possible. However, if you would prefer to choose your own then you can simply ignore them and create new ones (up to 1,000). You can do this by navigating to Categories > New Category