You can change the following preference on the 
  General >
  Appearance preferences page.
| Option | Description | Default | 
|---|---|---|
| Enable Theming | Specify whether theming of the user interface should be enabled. If disabled the usage interface will only use operating system look and feel. | Enabled | 
| Theme | Specify the currently active theme (look and feel). This setting is only available if "Enable Theming" is enabled. | Dependent on the operating system | 
| Color And Font Theme | Set this to "Reduced Palette" to reduce the amoung of different colors used and to increase contrast. This setting is only available if "Enable Theming" is enabled. | Dependent on the operating system | 
| Use round tabs | Specify whether the corner of the tabs should be rounded. | Disabled | 
| Use mixed fonts and colors for labels | Specify if the views should utilize colored labels. | Enabled | 
| Show most recently used tabs | Specifies whether the list of tabs should be sorted in the order in which they are most recently used. | Enabled | 
| Always show full titles | Specify if the tabs in view areas should always show full titles. This setting is only available if "Enable Theming" is enabled. | Disabled | 
| Hide icons | Specify if the icons for tabs in view areas should be hidden. This setting is only available if "Enable Theming" is enabled. | Disabled |