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Hi @sergiosergio,
Please take a look at Settings > Help & Getting Started > Shortcode to get more details on all the shortcode attributes.
In your case something like this might work:
[open-user-map region=”London” ids=”25|26|27″]This will show a map with pre-selected region London and just three markers (with the Post IDs of 25, 26 and 27).
Best regards,
Daniel