DotNetNuke has the concept of module references that come in handy here. Essentially, you can delete a new module on a page and configure it as you like, then go to another page and instead of dropping a new module, you select an existing module from another page. Now each of the modules seems to be separate, but in fact it is the same module that appears in different places. Then you can edit the module and the content will change on different pages. *
To answer your question specifically - I don’t think the default content is configured that way. You will need to log in and delete all of them (with the exception of one), and then indicate the rest in another place.
A few notes:
This behavior is not absolute in all modules, technically each module gets a decision on how it is divided between pages. Most modules, and especially the text / html module, work as I described, but some more advanced modules cannot.
In addition, the “copy module” option in the photo above will create a new module based on the original. If you do not have the selected copy module, a new module will not be created, the existing one will simply be referenced.