If inserting a watermark on some pages causes it to disappear on others, try using a custom watermark to put the watermark on all pages.
Tip: If you already have a watermark, remove it, or you'll have two on the same page.
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Go to Design > Watermark > Custom Watermark.
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Choose Picture Watermark and select a picture, or choose Text watermark and type your watermark text in the Text box.
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Select OK.