Hi @ns001, close the Opera, go to the Opera's profile directory (you can find the path in O-Menu->About Opera->Paths->Profile), open the "Preferences" file in your text editor, and make sure that the first 10 lines will be exactly the same as below:
{
"Keybindings": {
"Basic": {
"AddBlankTab": [ "Ctrl+N" ],
"OpenWindow": [ "Ctrl+T" ]
},
"Settings": {
"AdvancedEnabled": true
}
},
Save the changes, close the file, and reopen the Opera.