Styles Determine the Default Values of Elements
Styles enable administrators to set the default values that will be applied to all properties of such elements as sheets, geometry, annotations, dimensions, dress-up and dress-up symbols, callouts, etc.
The default values are defined and stored in the standard XML file, where a set of new parameters are defined, one parameter for each element property whose default value can be set.
Default values are applied to elements as they are created. After creation, the user can modify element values as required.
If you modify styles in the standard itself and then update the standard file used by the drawing, the elements which have already been created will NOT be modified (i.e. their default values will remain as previously). Updating the standard will only have an impact on the next elements to be created.