The Asset Browser (as opposed to other Filebrowser) is restricted to either FILE_HORIZONTALDISPLAY / FILE_IMGDISPLAY, as noted in https:// projects.blender.org/blender/blender/issues/103563#issuecomment-82835 the UI isnt polished enough for FILE_VERTICALDISPLAY it seems. However, resetting to default would leave us with exactly that. To resolve, control the default dynamically via an `RNA_def_property_enum_default_func` (and set it to FILE_IMGDISPLAY for the Asset Browser). Pull Request: https://projects.blender.org/blender/blender/pulls/144917