I use the last OS (Big Sur 11.2.1 (20D74)). I don't know when it happened, but now when I make double-click on a folder, finder always opens a new tab. I haven't change any option recently and I don't know why that could happen.
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Do you have the Toolbar hidden? This would make each folder open in a new window or tab.
If the problem is opening in a tab vs opening in a window, go to Finder->Preferences->General and uncheck the last box.
Do you have the Toolbar hidden? This would make each folder open in a new window or tab.
If the problem is opening in a tab vs opening in a window, go to Finder->Preferences->General and uncheck the last box.
Finder always opens new tab on double clicking on a folder
