Bottom Tracking of e97 MFD

We are also having problems with keeping the bottom tracking for an e97 MFD with SW version V19.03 with a transom mounted transducer (P58 I think). The attached file shows the bottom being tracked with the system automatically picking a depth range with a large school of fish on our spot with our boat anchored. It was expected that the fishfinder would know the difference between a natural hard bottom and a school of fish and not adjust the depth scale as a school of fish passes under the boat. I know we could manually fix the depth but thought there was another way to keep it in automatic mode as we might forget to change modes as we move the boat a few hundred feet to adjust for changes in current and wind while anchored.
Thanks in advance for any advice

  Dump013.png (Size: 54.99 KB / Downloads: 1)

  Dump012.png (Size: 71.6 KB / Downloads: 1)