I've tried many things, but I finally figured it out.
The solution is;
Open this path in File Explorer C:\Users\<username> \AppData\Roaming\Opera Software\Opera Stable
Find this file: Local State
Right-click the file and open it in notepad++ (etc.)
Change the 2 fields below. (Enter your country information.)
country":"NL","country_from_server":"NL"
country":"TR","country_from_server":"TR"
Clear the following values.
"last_startup_timestamp":"13213137098111886"
"last_startup_timestamp":""
"last_verify_time": "13213137703649929"
"last_verify_time": ""
Open the browser and search anything in address bar. Allow when Google wants to access your location. (I'm not sure about that. Your choice.)