A customer recently contacted me with a strange situation: they were unable to drag the breaks in a SOLIDWORKS projected view in their drawing. See the image below as an example: the bottom view is the parent view and the top view is the projected section view.
There is a setting in SOLIDWORKS to control this behaviour. Right-click the projected view where you would like to modify the breaks, then select “Properties”. There is a checkbox in the resulting window for “Align breaks with parent”. If this is selected, the breaks in the projected view are locked. De-select this option to modify the breaks.