Hi stovepipe999,

With the current expense's transaction list it only filters in a-z format on the transaction page and at this time can't be filtered by category groups. This also to extends to filters that may include or exclude specific categories. I would encourage however to lodge this type of feedback which can be found;

1. Select the Gear Icon in the top right
2. Then you can select the Feedback option (below the Profile column). 

Thanks

-Steven