Using the application Terra4D Setup you can set and configure themes for all TERRA 4D applications.

Default setting of version 3.10 are Qt style: KvantumDark, Kvantum Style: KvArcDark, Icon theme: Terra4D Dark:

There are mainly 3 items defining the look of the applications:

• Style: defines the design of application elements (buttons, lists, menus, …)
• Icon: defines a set of icons (e.g. for dark and light backgrounds)
• Colors: the colors used for the style elements

Go to Terra4D Setup and to tab User interface to select the previously mentioned theme elements. The following screenshots are showing commonly used examples together with a screenshot of the Terra4D Setup settings:

Similar to Arc Dark with more margins (space around items)