The reason for which new categories cannot be added is that Wallet uses machine learning that works with structured data. If users added categories themselves the data would no longer be properly interpreted by the app and its features would return statistics that are not as accurate or relevant.
However, you can rename the main categories or add your own subcategory.
For more information on how you can edit your categories, please check our FAQ article All about categories/subcategories.
We also recommend using labels, which are very helpful in working with transactions.
Tip: To hide a Main Category, hide all of the subcategories under it!
Tip: You can also bulk edit your Records to apply a category to many Records at once!