Unlike paths, you can see the nonprinting strokes (outlines) of frames by default even when the frames aren’t selected. If the document window is getting crowded, use the Show/Hide Frame Edges command to simplify the screen display by hiding the frame edges. Doing this also hides the crossbar in a graphics placeholder frame. The display setting for frame edges doesn’t affect the display of the text ports on text frames.
To show or hide frame edges, choose View > Show/Hide Frame Edges.
To hide frame edges, click Preview Mode at
the bottom of the Toolbox.