Thanks for this extension
But I can use WhatsApp without an extension too so in my opinion spotify should be there too.
Maybe we will get this from the developers, maybe not, we will see.
Bump? This issue still occurs on Opera GX build 67.0.3575.87 on Windows 10 64bit. Running a vega64, ryzen 5 2600x, 16GB of RAM and the browser is installed on an SSD. Running a dual monitor setup like the OP. This issue severely hinders my enjoyment of the browser and seeing it still occur so many months after this initial post is worrisome to say the least.
I disagree personally. I find the sidebar very "future and gaming-esque". The only downside is that the different sidebar icons doesn't suit the style of the GX sidebar. Someone did ask for other GX styled icons, but moderator @leocg said (in Opera GX styled icons for WhatsApp, Telegram, Messenger and VK?):
It could lead Opera into legal issues.