I would like to have the map contact identifiers and map contact identifiers source checkboxes selected by defualt. I thought that this would be located on the item in the core db but I did not see anything. Anyone have an idea of how I can achieve this? I have attached a screenshot of what I am attempting to set by default. This a on Sitecore 9.0.2.
Actually, this configuration is not a part of items. I found only one way how to achieve your requirement. So we need to override the following file:
Look at the following image:
You need to change the values in yellow to "true".
After the clearing a browser cache and page reloading, the checkboxes became checked by default.
I tested on Sitecore 9.3, but I don't think it works in different way on previews versions.