Ask for help and post your question on how to use XnView MP.
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In the viewer, I think you would have to open each image in its own tab, then apply the desired operation individually to each image, and then select each tab in turn, unless I'm missing something. [ ]
However, you should be able to get at least part way to what you are looking for using Tools > Batch convert... where you could load a set of images, set up an action or actions, and then use the preview facility as a viewer to step through the images with the action(s) applied. If you then exit Batch convert without initiating a conversion, the images loaded will be unchanged...