I will preface by saying I only have Opera GX (so I'm not sure if this is a problem on the main Opera browser). I noticed that if I have two windows open side-by-side and attempt to organize my tabs by dragging a tab from one window to the other, the tab does not get added to the other windows tabs, but it creates a new window for the tab. It appears to me that there is no way to transition tabs between two windows.
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