I found something that actually works for me. so mine also shows only on the taskbar but the browser doesn't show up on my screen. so what i did is i open another application and then i pressed windows + arrow key left or right so that the app that i recently opened will be put on the right or left half of the screen. and then it will automatically gives you an option to which opened app will go on the other half of the screen. and there Opera GX showed up and can be placed on the other half of the screen. then voila!
- open another app.
- Press win + left arrow (or right arrow). your app will be placed on the right/left half of the screen.
- Then choose opera to be placed on the other half of the screen.
EZ. Hope it'll help ya'll too.