In Surveyor, the yellow lines are at 10m, the black lines in between the yellow lines are 5m. When you create a new Route it automatically sets the field to 10m. You must then change it to 5m after that. If you have not painted any surfaces and change from 10m to 5m you will not notice any difference.
When adding new baseboards you can select either 10m or 5m. Some people here have suggested that where your tracks are laid to make those baseboards at 5m, and then the surrounding baseboards at 10m for performance reasons. I'm on the fence with that, and have all my baseboards at 5m for a higher detail.