Things are fairly simple here:
You can navigate to a certain WBS of interest from the list on the left.
We then have certain navigation actions in place you can take to navigate possible overflow of information. Clicking on an action will change the mouse cursor.
Make a WBS the focal point of the screen
Expand a WBS to its children
Opposite of expand, collapses all WBS children to their parent.
Remove a WBS from the diagram & timeline altogether. When you remove a WBS it will show up at the top of the screen. Clicking on it again will bring it back on screen
Move the WBS around within the screen
Snap all WBS in a position that they don't overlap themselves.
We get that navigating the whole project may be difficult so even if you find yourself somewhere you don't want, you can always go back with the undo and redo buttons.