Please check your security policy file.
You can find those files under CuteSoft_client/CuteEditor/Configuration/Security folder.
The following settings will apply to the thumbnails.
<security name="ThumbnailWidth">80</security>
<security name="ThumbnailHeight">80</security>
<security name="ThumbnailColumns">5</security>
<security name="ThumbnailRows">3</security>
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