In TheBrain 7 you set links which have a direction to be one way. This will only show the linked thoughts when viewing as follows (provided by jbennett):

  1. If the one-way link is directed from the parent to the active thought, then the plex will not display the link.
  2. If the one way link is directed from the active thought to its parent, then the plex will display the link and the parent.
  3. If you had already selected the parent and then used instant activation to select one of its children, the plex will display both the parent and the child, regardless of link direction.

 

To create a one way link, complete the steps in Link Direction to create a directed link, then click the one way box.

 

You can identify on way links as it will have a line under the arrow: