The reason why this has never been removed or an option for removing it has been added is because Opera doesn't care or really want developers using their browser.
We are not their main target and we're the furthest from their mind so using the extension linked above is the best solution we'll get.
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Best posts made by nashuim
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RE: [Solved]How to remove the Warning message in Dev Console?Opera for Windows
- Blogs
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RE: Is it possible to disable the default JSON viewer?Opera for Windows
@burnout426 Thank you! That's exactly what I was looking for
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RE: Opera 87.0.4388.0 developer updateBlogs
@leocg
DNA-98390 DevTools’s console warning about copying scripts

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RE: Opera 113.0.5227.0 developer updateBlogs
@andrew84 The issue wasn't with the browser itself, it was with a built-in extension. Opera is able to update built-in extensions without updating the browser like with regular extensions
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RE: Opera One (100.0.4790.0) Developer updateBlogs
Dragging a tab doesn't let you add it to an existing window like it used to. You can only create a new window now