Thank you for writing to us.
By design you can only see a part of your tree at at given time,
to make processing easier and faster for you computer.
The other people in your tree are showed in "pruned" branches (the very small pink and blue icons that you can see above certain individuals).
You can click on these icons to show the "hidden" parts of the trees.
Aviv / MyHeritage.com Support Team
As Aviv's reply explains, you could view only a branch of your family tree at a time, due to the display settings of the site.
There is an option for you to create an all-in-one chart, that will include all your family members.
That way, you could view your whole family in one pdf file.
In order to create the chart, please enter your stie > go to Family Tree > Charts and Books > Select all-in-one chart type.