On the very bottom of the page below your family tree display, you will see this display:
Print / Hide Sidebar / Show Key / Back to Me / Find / - +
Show / Parents / Children / Others
These options all have dropdown menues. Select Parents / Children / Others dropdown menues and choose a larger number. This allows you to show as many generations from that person as you want. It allows 15 generations from your children, parents, and others. You can pick and choose what number/how many generations at random for each one.