To change your default search engine in Brave browser, follow these steps:
1. Open Brave browser and click on the three dots in the upper-right corner of the screen.
2. Click on 'Settings' from the drop-down menu.
3. In the 'Search Engine' section, click on the drop-down menu and select your preferred search engine. You can choose from options like Google, Bing, DuckDuckGo, etc.