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I just tried using the latest version (LVL1 (core: 63.0.3368.57756)). Clicking the icon shown at the top of the video, a youtube video in this example, does correctly create a stand-lone instance.
Perhaps you can explain is detail what is your issue -- pictures really help.
These are the browsers supported by Kaspersky (https://support.kaspersky.com/us/common/safemoney/12782)
So the big question is what video viewer, if any, are those two sites (crunchyroll, funimation) using?
Hovering over active GX control does not show what it is
C:\Users\{Username}\AppData\Roaming\Opera Software\Opera GX Stable\themes
They are stored in ZIP files.
Can you post the Youtube video URL so the forum members can see if that particular video also appears terrible on their computers. I have tried many Youtube videos, playing detached and in-browser, without any issues. I am also using various extensions, like ad blockers, without any issues.
Can you post the Youtube video URL so the forum members can see if that particular video also appears terrible on their computers. I have tried many Youtube videos, playing detached and in-browser, without any issues.
I looked at "Advanced SystemCare|" (https://www.iobit.com/product-manuals/asc-help/#System-Requirements) and it is very specific at to what browsers are supported. It does say that is supports Opera but does not says it supports Opera GX. I would contact them directly and ask them to kindly support Opera GX.
The same thing goes for CCleaner (https://www.ccleaner.com/ccleaner/features). It does say that is supports Opera but does not says it supports Opera GX. I would contact them directly and ask them to kindly support Opera GX.
Perhaps, though perhaps it should be mentioned in the version. Very confusing otherwise for those who try to help people with their problems and rely on the version number as a guide.
I am on the Early Access stream.
I could not find on the Opera website to download Opera GX as either a Beta or Developer version. It looks like those two versions are only for the normal Opera browser.
https://www.opera.com/computer/beta
The Beta is: 
The Developer is: 