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These image tools will only take effect if you export an image. Here you can overlay a watermark to your images e.g. with your logo or copyright information.
To overlay your images with a watermark, select “Watermark” from the options in the “Export Objects As…” window. This opens the Watermark window.
In the right “Layer” area, click on any layer you want to edit. From the toolbar on top of the list you can add images or text to overlay, or you can remove the current selected layer. The current layer is highlighted in the list and the element is displayed with a frame on the image preview.
In the bottom properties area you can modify each single layer.