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I'm a newbie and I'm having difficulty deleting images I'm placing on my sample program. For example I just dragged a button to a page and then tried to remove it. It's highlighted, but when I go to "Object Properties/Edit/Remove highlighted image" it gives me a warning which I reply "yes" and nothing happens/changes. What am I doing wrong?

The highlight menu refers to the alternate image for the object. To delete anything from a page, single click it & then press your backspace or delete key on your keyboard.

To delete multiple objects, draw a box around them, or control-click them, and then use the delete button on the group menu which appears.