@voyageur1 Hey, Im not sure if this is a windows issue or an Opera issue, but the problem only occurs with Opera after the latest update to version 75.0.3969.149.
However this fixed it for me:

1. Hold down the Windows Key, then press “D“. Repeat these steps to see if it makes the window you are looking for reappear.

2. Alternately, you can right-click a blank area of the taskbar, then choose “Show the desktop“, then repeat.

this page might help:
https://www.technipages.com/bring-off-screen-window-back-onto-screen

@makaroni
Hey, Just updating my post. I'm not sure if this is a windows issue or an Opera issue, but my earliest encounter with the problem is after the latest update to Opera version 75.0.3969.149. I am currently on version 77.0.4054.90. The issue usually will occasionally reappear when I unplug or plug my laptop from my monitors. I am also on Windows 10.

However this fixed it for me:

1. Make sure your "invisible" Opera window tab is selected, you can just click on the icon from the window taskbar.

2. Hold down the Windows Key, then press “D“. Repeat these steps to see if it makes the window you are looking for reappear. (you might have to hit Windows + D a few times, sometimes it takes me 3-5 repetitions)

3. Alternately, you can right-click a blank area of the taskbar, then choose “Show the desktop“, then repeat.

this page might help:
https://www.technipages.com/bring-off-screen-window-back-onto-screen
https://superuser.com/questions/647751/shortcut-to-show-desktop-on-windows-7 (might help if you are on windows 7)

Hope it helps

@bulldwang
Hey just reposting what is above. Maybe you can try this out.
I'm not sure if this is a windows issue or an Opera issue, but the problem only occurs with Opera after the latest update to version 75.0.3969.149.
However this fixed it for me:

Hold down the Windows Key, then press “D“. Repeat these steps to see if it makes the window you are looking for reappear.

Alternately, you can right-click a blank area of the taskbar, then choose “Show the desktop“, then repeat.

this page might help:
https://www.technipages.com/bring-off-screen-window-back-onto-screen

@jiafoongwee Update, the problem start occurring again. This time disabling and enabling the graphics drivers doesn't work, even if my laptop is not plugged into the second monitor. Tried reinstalling but same problem. Anyone have similar problems?

@sgunhouse Yes I did, same issue when it restarted. I can right-click on the Opera icon from taskbar to open new windows, Opera seems to recognize and keep track of how many windows are open, but those windows are not displaying.

When I hover over each of the windows from taskbar. I just brings me to the desktop.

@jaden2929

Having the same issue here. I tried watching youtube videos in incognito mode and it work. Eventually i found out that for some reason my Synchronization was turned on. I signed out of opera sync and it worked for me.

EDIT:
Issue reoccured. I just added youtube.com to the Opera's ad blocker exception list

Link to similar topic
https://forums.opera.com/topic/65434/a-strange-problem-on-youtube

@fixitopera
Nice workaround! I speculate that it might be a windows scaling issue with the Opera Window. Sometimes pressing the "Windows Key" + "arrow left/arrow right/arrow up/arrow down" to snap the Opera window might work. I figure trying any sort of keyboard command to manipulate the Opera window might fix it.

@makaroni
Hey, Just updating my post. I'm not sure if this is a windows issue or an Opera issue, but my earliest encounter with the problem is after the latest update to Opera version 75.0.3969.149. I am currently on version 77.0.4054.90. The issue usually will occasionally reappear when I unplug or plug my laptop from my monitors. I am also on Windows 10.

However this fixed it for me:

1. Make sure your "invisible" Opera window tab is selected, you can just click on the icon from the window taskbar.

2. Hold down the Windows Key, then press “D“. Repeat these steps to see if it makes the window you are looking for reappear. (you might have to hit Windows + D a few times, sometimes it takes me 3-5 repetitions)

3. Alternately, you can right-click a blank area of the taskbar, then choose “Show the desktop“, then repeat.

this page might help:
https://www.technipages.com/bring-off-screen-window-back-onto-screen
https://superuser.com/questions/647751/shortcut-to-show-desktop-on-windows-7 (might help if you are on windows 7)

Hope it helps

@bulldwang
Hey just reposting what is above. Maybe you can try this out.
I'm not sure if this is a windows issue or an Opera issue, but the problem only occurs with Opera after the latest update to version 75.0.3969.149.
However this fixed it for me:

Hold down the Windows Key, then press “D“. Repeat these steps to see if it makes the window you are looking for reappear.

Alternately, you can right-click a blank area of the taskbar, then choose “Show the desktop“, then repeat.

this page might help:
https://www.technipages.com/bring-off-screen-window-back-onto-screen

@voyageur1 Hey, Im not sure if this is a windows issue or an Opera issue, but the problem only occurs with Opera after the latest update to version 75.0.3969.149.
However this fixed it for me:

1. Hold down the Windows Key, then press “D“. Repeat these steps to see if it makes the window you are looking for reappear.

2. Alternately, you can right-click a blank area of the taskbar, then choose “Show the desktop“, then repeat.

this page might help:
https://www.technipages.com/bring-off-screen-window-back-onto-screen

@jiafoongwee Update, the problem start occurring again. This time disabling and enabling the graphics drivers doesn't work, even if my laptop is not plugged into the second monitor. Tried reinstalling but same problem. Anyone have similar problems?

@jiafoongwee Okay, I sort of figured it out. I was using my laptop with 2 extended monitors.
Disabling the intel graphics driver and reenabling it worked for me. I had to try a it a few times taking turns disabling and enabling Intel and Nvidia graphics driver.

@sgunhouse Yes I did, same issue when it restarted. I can right-click on the Opera icon from taskbar to open new windows, Opera seems to recognize and keep track of how many windows are open, but those windows are not displaying.

When I hover over each of the windows from taskbar. I just brings me to the desktop.

@voyageur1
I have the same issue, I am worried to uninstalled opera as I will loose my session buddy saved tabs. Opera browser seems to be working in task manager but couldn't for some reason find the opera window.