You can choose the number of related results that must exist for something to appear in the diagram. For example; when the Min Results is set to 5, any 2 entities with 5 or more results connecting them will appear.
Increasing this number will give you fewer results with stronger connections.
Reducing this number will give you more results but with weaker connections too.
Select the Min Result field.
Enter the minimum number of results between a connection you want.
Or use the up and down arrows to reach the number you want.
When you change the number the diagram will automatically update.