You can hide a project from the overlapping view by deactivating the tab. Objects specific to that project will then not be seen in the overlapping view.
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To deactivate, hold Control key and select a project tab (CTRL + Click).
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To reactivate the project, use the same method. You cannot deactivate all the projects in the overlapping view. At least one project must remain active.
Clicking a project tab displays the drawing in that project on top, moving the rest of the drawings to the background. All objects in the currently selected project will be displayed in the project's assigned color. Objects that exist only in other projects or objects that have been moved will be displayed in the colors assigned to their respective projects.