Microsoft Visio - Collision Management
Microsoft visio tutorial
Microsoft Visio - Collision Handling
When adding many milestones, it is possible that the deion text of the milestones will collide, creating a messy look. It is possible to avoid collisions by changing the position of the milestone text.
If you have colliding text, just grab the yellow end of the milestone and drag it to a separate position, like bottom or top. You can also tilt the yellow end just by rotating your mouse to the desired angle. The idea is to make sure that the text does not collide and is represented as clearly as possible.
Once the yellow end is moved and released, the shape of the Line milestone adjusts accordingly. You can also use the guides to glue the yellow ends of multiple milestones so that they are all aligned.