Is it possible to reset Gmail settings to the default settings?
Which will be like the settings you get when opening your account.
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It is possible but only manually by looking at reference pictures of fresh account. These tutorials can be used as those references:
In other words, Gmail does not have any "reset to default" button so the only way is to track back those settings from various online sources or by creating a new account and checking and using those settings as the reference point.