In Sitefinity CMS, all widgets that display images have an option to display image thumbnails. A number of widgets, for example, the Image widget and the Content block widget, give you additional option to specify a custom thumbnail profile in the widget designer.
For more information about widget designers, see Overview: Widget designers.
If you have created new widgets, user or custom, that display images, you can also add this functionality to the widget and the widget designer. That is, add thumbnail profile selector in the widget designer and, if required, an option to specify a custom thumbnail profile.
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