The "threaded/unthreaded/grouped by sort" switch in "Settings > Appearance" only sets the default . The next folder you create will have this setting, it will not be applied to all currently existing folders. This is an invalid bug but an extra feature to apply the setting to all folders could be added.
Bug 1960978 Comment 2 Edit History
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The "threaded/unthreaded/grouped by sort" switch in "Settings > Appearance" only sets the default . The next folder you create will have this setting, it will not be applied to all currently existing folders. This is not a defect but an extra feature to apply the setting to all folders could be added.
The "threaded/unthreaded/grouped by sort" switch in "Settings > Appearance" only sets the default . The next folder you create will have this setting, it will not be applied to all currently existing folders.