@leocg
Solved!
When looking at your screenshot I saw that the "+" button to add tabs did not appear, and that the bar with the login, configuration and Share buttons was at the bottom of my screen. That gave me the clue that it was a design issue. I went to Settings and Design, and there I saw that the Create tabs option was disabled.
@cska133
Sorry, I didn't understand you. I have downloaded the ADB drivers for Windows and also a ".gui" file (universal-android-debloater-gui-0-5-1) that allows you to use the tools in a more user-friendly way. However, I have not tried to do so yet and I I will wait until I have problems with Opera, since right now it works fine. Regards