Styling for MapInfo is set in the mapinfo.mapinfo_mapcatalog table. If styling doesn't exist when a table is created then the styling rules stored in the mapinfo.mapinfo_mapcatalog_configuration table will be used instead. Please refer to MapInfo documentation for information on the correct values for the styles you require. 

Any changes to the default MapInfo styling will only be applied to new tables created using Studio and pre-existing tables will have been created with the original defaults.

MapInfo Styling

The above screenshot shows an example of an update to the SYMBOL_LINE entry.

The following screenshot details the entries that may be overridden.

Symbol Entries