Problem:

Unable to find Prefs folder for OpenBuildings Designer. 

Solution: 

When you Install OpenBuildings Designer there is a prefs folder that gets created in user data which holds all the local configuration changes, ribbon changes etc. You have 2 ways to get to the location  

1. When you are inside OpenBuildings Designer, search for Key-in and in the Key-in type "$ % explorer $(_USTN_HOMEPREFS)". Once you hit enter, the Prefs folder will be opened automatically. 
   
   
2. If OpenBuildings Designer is not opened then you can manually open the location from your file explorer. 
   
   Path to the Prefs folder: C:\Users\User.name\AppData\Local\Bentley\OpenBuildingsDesigner\10.0.0