This is a half-baked idea, so i'm testing the grounds here.
It shouldn't happen, but sometimes stuff is hidden under other code, like overlapping functions, something outside a case structure or under (and outside) a case. This could be through font size changes (an Unbundle growing) someone resizing a case without Autosize or similar.
What if such items could be seen through in a faded fashion, such as a Case structure had 80% opacity? Ofcourse this wouldn't affect the different cases within a case structure, but only to items outside it. The same with other structures.
This ties back to another idea on this forum about being able to select some items and choose Disable, with this in addition you could create one Disable around all, the the non chosen parts can still be seen, though in a faded fashion.
/Y
Any idea that has not received any kudos within a year after posting will be automatically declined.