Remember that Acceptance is not trying to change anxiety or depression. The whole point is to learn to have them and get on about living life.
First, we quickly show the pattern of the ACT Matrix: senses, mind, satisfaction, and relief. Then we fill in who's important in the lower right, yucky stuff in the lower left, relief behaviors in the upper left, and satisfaction behaviors in the upper right.
Then we add stuck loops on the left side. In this case, we would help the person draw anxiety and depression loops.
We then ask how much time out of a 24-hour day the person spends on the left and the right sides.
Noticing this pattern is now the focus.
You can talk about other stuff to fill your time, but be careful not to add extrinsic motivation or judgments.