Adding a couple of images along the way!
1. Open up the family you are using as a bracing member in the family editor.
2. Click on Home>Properties>Family Category and Parameters from the ribbon.
3. Under the ‘Family Parameters’ section of the dialogue, change the value of the ‘Symbolic Representation’ parameter to ‘From Project Settings’.
4. Save you family, reload it back into your project, and your the vertical bracing should now show in plan view as per your project settings.
Thanks to Mark Fox, author of Revit Fox for sharing this!