Related subjects →  Select , Masks , Forms (Form XObjects) .

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This Enfocus PitStop command allows us to select objects that are completely clipped away or masked and not visible.

In addition, you can choose the option "Select also invisible objects that belong to this form" (meaning an "XForm object", not an interactive form).

Warning: This command does not refer to objects that are invisible because they are not inside one of the page boxes (for example, the CropBox), which are not masked, but simply not displayed. It does not refer either to objects that are covered by other objects simply because these are on top of them. They must have a mask or clipping path applied that completely hids them.