Follow these instructions to change theme on Brave:
1. Go to the Chrome Web Store at https://chrome.google.com/webstore
2. Select Themes from the left side menu.
3. Choose a theme you want to install.
4. Once on the theme page, click the Add to Brave button.
Going back to the default theme is also easy, follow these steps:
1. Click on the three horizontal lines on the top right in your browser.
2. Select Settings.
3. Go to Appearance on the left.
4. Where it says “Themes” click on the “Reset to default” button.