You can change the default reply setting that's displayed when you open a message.
Note: If the instructions don't match what you see, you might be using an older version of Outlook on the web. Try the Instructions for classic Outlook on the web.
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At the top of the page, select Settings .
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Select Mail > Compose and reply.
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Under Reply or Reply all, choose your default response when you reply from the reading pane:
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Reply: Your reply is sent only to the sender.
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Reply all: Your reply is sent to everyone on the To and Cc lines.
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Instructions for classic Outlook on the web
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At the top of the page, select Settings
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In the Options pane, select Mail > Automatic processing > Reply settings.
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In Reply settings, choose the option you prefer:
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Reply: Your reply is sent only to the sender.
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Reply all: Your reply is sent to everyone on the To and Cc lines.
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Select Save.
