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Set the AllowResize property to true to display a size grip element that allows users to resize an ASPxHtmlEditor.

<dx:ASPxHtmlEditor ID="HtmlEditor" runat="server">
    <SettingsResize AllowResize="true" />


Use the SettingsResize property to access settings that limit the HTML Editor’s size:

The editor’s actual size is preserved in the client state and restored after each round trip to the server (postback or callback).

Online Demo

Resizable Editor