CMS Items on editor


Would someone be able to tell me that on the on screen editor can CMS items have there image changed? I hover over the image from the CMS item click the picture icon and then select a new image. This the shows the spinning icon, and say background image published but then nothing changes.

It would be good if CMS items could be only edited in the collection options of Webflow but when I tried to make the elements of the CMS non editable it still brings up the picture icon.