Look back at the answer from Ari Villafuerte on Mar 14, 2019. "Whenever I want a new map I start by importing a layout file and that locks the settings for each layout. Before doing so, create a layout file that you can re-use by clicking on "Share" --> Layout File. Once you're ready to create a new map within your current project, click --> Insert --> New Layout ---> Import a layout file Add all the layers needed and you will see that anything that you change on that layout will not be reflected on the others." You will end up with layouts that are independent (not locked) in the same Pro project.
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