Please open your web.config and set UseDNNDefaultWidth="true".
<add name="CEHtmlEditorProvider"
type="DotNetNuke.HtmlEditor.CEHtmlEditorProvider, DotNetNuke.CEHtmlEditorProvider"
providerPath="~\Providers\HtmlEditorProviders\CEHtmlEditorProvider\CuteSoft_Client\CuteEditor\"
UseDNNRoleASFileNamePrefix="true"
UseDNNRootImageDirectory="true"
UseDNNDefaultWidth="false"
RemoveServerNamesFromUrl="true"
ConvertHTMLTagstoLowercase="true"
UseRelativeLinks="true"
UseHTMLEntities="true"
...........
/>
Keep me posted
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