Brave allows you to display the app in light or dark mode to suit your preference. To change the browser theme on iOS:

1. Launch Brave and tap Main menu --> All Settings.
2. Scroll down to the Display section and click Appearance.

Here you will find the themes available.

• Automatic: When enabled, the browser automatically follows your device's system theme, switching between light and dark mode based on your OS settings. 
• Light: Changes the browser to use the "light" theme.
• Dark: Changes the browser to use the "dark" theme.

Experimental Night Mode

When this option is enabled, the browser theme will be "dark" automatically and in addition, the browser will attempt to force the content of a webpage being viewed to display in a "dark theme". 

Note: This setting can occasionally cause certain websites to appear incorrectly. This happens because the feature relies on detecting “light” colors on a webpage and inverting them to create a dark theme. Depending on the specific color values a site uses, the inverted result isn’t always ideal. For example, a page with a white background and gray text might be inverted to a black background with dark-gray text, making the content difficult to read.