Changing Themes (iOS and macOS)
How do I change themes?
Open Twitterrific's sidebar and press the theme button (the center button at the bottom of the panel). Here, you can change to the dark or light theme, select a font, change the font, avatar and line spacing size, and set the in-app brightness. You can also use a two-fingered swipe gesture to instantly change from the dark to light theme and vice versa.
Press command-', to open the preferences panel and then click the Appearance tab. Select the theme you would like to use from the Timeline Theme selection menu to see the results in real time on the desktop.