Filters can be found on every tab except AI Chat. The icon is located at the top right. There are up to 9 categories of filters. Multiple filters can be selected at the same time. Filters are set on a per page basis and are not carried over to the other tabs. Once filters are set, they can be completely deactivated or reactivated using the quick access. The button for this appears to the left of the filter function at the top.
In IOS, a new window opens for the filters. Here you can also pin any filter categories you like, which will appear above the words and can be changed quickly. When filters are set in game mode, only words that match the filter will be displayed. If a filter is set, but the app does not offer words for that filter, no words will be displayed unless you remove the filter.