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Collage same image or multiple images to one document file
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Why?
Do you know what device you are using?
What OS?
Which Lightroom are you referring to?
If you subscribe to a Photography plan- Adobe Spark is free. https://spark.adobe.com/make/photo-collage-maker/
If your Photography Plan includes Lightroom-Classic and Photoshop- you have all the tools you need. (and only for us$9.99/mth annual plan)
Searching Googly finds some sites- eg. https://windowsreport.com/photo-collage-software/