Homeport Sonar reviewing

Hi. I am using Homeport to review my sonar recordings from my echomap 50dv device. The problem is that when I review the recording and say I go from 5 to 25 meters of depth on the same recording, then what I see in homeport is the depth at 25 meters and everything in 5 meters is very small to analyse. When the recording reaches 25 meters then I have a clear image. I am attaching two photos to explain that to you. . Ia there a zoom option? Thank you very much.