If your grids are assigned to a scope box but aren’t moving when the scope box moves, you’ve likely run into a common Revit issue.
This usually happens after adjusting grid extents, which can silently break the connection between the grid and the scope box.
In this quick video, I show:
Why grids stop following a scope box
How that connection gets broken
The fastest way to fix it
Fix in seconds:
Select the grid
Set Scope Box to None
Reassign the scope box
That’s it, your grids will move with the scope box again.