Interface-Appearance
Titlebar
The document windows can be displayed either with or without titlebar. To change the current display mode, go to the menu View > Show titlebar or Hide titlebar depending on which window display is currently active. Then all open windows change their appearance.
Text-settings for CSV- and Markup-View
For the text-field, the font-type, -size, -color and background-color can be adjusted as well as a line numbering can be set visible or hidden. To do this, either switch to the CSV- or Markup-View and press the gear-button. In the popover-window that opens, you can make the appropriate settings.
Note: The settings apply to both CSV- and Markup-Views.
Note: The settings are treated separately for the light- as well as the dark-window mode.
Bright / dark interface
The document windows can be displayed in either light or dark.
In macOS Mojave, the corresponding appearance is automatic and is dictated by the general user settings.
Users of a macOS version before Mojave can switch the current display mode by clicking on the menu item Display > Light User Interface or Display > Dark User Interface in the main menu, depending on which window display is currently active. As a result, all open windows change their appearance.