Following the online documentation there are two possibilities to place vias.
1.) Press * key or Shift+Ctrl+Mouse wheel in interactive routing mode. You can choose the favorite via size in the Favorite Interactive Via Sizes dialog pressing Shift+V while routing.
2.) Press V to place a via when not routing. As the documentation says, a default via will be placed.
How do I change the default via settings? When nailing vias into polygons and planes, I am not in interactive routing mode and I do not want to change the settings for every via pressing the TAB key. I also do not want to select all vias with a filter and change the settings afterwards.
Oliver