DotPlant2 default creates thumbnails for uploaded images, the size of which is specified in the basic module settings. Sizes can also be set to be used in the outer part of the application.
To set a different thumbnail, go to the menu
Image/Thumbnail Sizes administrative part of the CMS.
On this page you can see a list of thumbnail creation sizes, create new, edit or delete existing ones.
Consider the shape of the field to create or edit the thumbnails:
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