1. In a digital media environment to facilitate creation of content using one or more computing devices, a method comprising: outputting, via a user interface for a digital media application, an image panel displaying image search results having candidate images for insertion in an image frame placed in a document exposed for editing via an editing panel of the user interface; detecting input to select a particular image within an arrangement of candidate images displayed in the image panel; responsive to detection of the input, generating a preview image of the document having the particular image inserted into the image frame; and displaying the preview image in the user interface as a preview that replaces a view of the document exposed for editing in the editing panel as long as the input to select the particular image is maintained.