Opera respects the OS proxy configuration, so you can set up SOCKS4, SOCKS5, or HTTPS proxies via the system’s network settings:
To access and modify the proxy settings in the Opera browser, follow these steps. Note that these instructions are based on Opera version 82.0.4227.33; the steps might slightly vary depending on the version of Opera you are using. opera browser proxy settings
To find the proxy configuration menu in the modern Opera interface: Opera respects the OS proxy configuration, so you
This action will redirect you out of the Opera interface and into your operating system’s network configuration window. Opera respects the OS proxy configuration