Hey @Graphic_Lady
There is such a tool to remove things in a photo in Firefly. It's just a little hidden.
1) Generate your image.
2) Click on the Edit button in the top Left Corner.

3) In the drop down menu choose Generative Fill

4) Choose Remove; Then adjust your brush size and other features related to the brush

5) Choose the area you want to Remove

6) Select the image and press: KEEP and download

āāāā
Cheers
O. Nate