Hi Markus,
you usually have the button "Propagate component data" over every filed in the database as I show you below:

Be careful to filter exactly the IDs you need. For example, if you want to propagate the title in the first 10 IDs of your documents collection, filter before from 1...10 in the filter, change the first ID, and then propagate it.
It'a usefull to test it with a limited number of IDs before to do massive changes.
Best,