There were already some menu items to customization pages under the "Site content" menu. It therefore makes sense to move "Custom images" and "Custom content blocks" (which were previously located under "Settings") to "Site content" as well.
There were already some menu items to customization pages under the "Site content" menu. It therefore makes sense to move "Custom images" and "Custom content blocks" (which were previously located under "Settings") to "Site content" as well.