The text editor used in OnSemble is a modified radeditor. Due to this it can use any basic skin that is in the radeditor library.
To modify the text editor:
1. Access the PortalTextEditor.skin file in your theme folder by following this path on the server or through File Explorer:
2. Change Skin="Windows7" to another base skin. Reference page of base skins -> click dropdown to see all choices.
Here are a few examples