Section Marks - Some Observations

A problem that seems to come up sometimes is getting section marks to look consistent on a series of floor plans. For grids and levels, the 'Propagate Extents' function serves this purpose, but doesn't extend to section marks. In absence of this, I set out to discover the rules that dictate how section marks behave in relation to views


The Scenario

The plan on the right (Level 1) is the view in which the section mark was placed. Both views are set to an identical crop box. The extents are at the border between the pink and blue shading (more on this in a minute)  As you can see, the marks display as required

Now in the plan on the left (Level 2), the view crop is adjusted. All four sides are within the shaded areas and the section mark remains unaffected

Moving one of the crop extents outside of this shaded area, the section mark revokes to its default initial view.

Conclusion

In short, there is a zone of 63.5mm (or 2.5" in old money), multiplied by the view scale.
This is applicable inside and outside the crop extents. (shown here as pink and blue).  
It relates to the view where the section mark is placed and governs the display in other views. Should the original view crop extents change, this zone will amend with it. Providing all four extents in any other views are within this zone, the section mark will remain unaffected

 In standalone views (ie non-dependent), the best way to control this is through a scope box. In dependent views, it is best to place and adjust the section mark in the 'Child' view, rather than the 'Parent View'.