Refreshing the Document Preview
When the document is changed, the preview in the document editor must be refreshed. It can be updated refreshed with a real-time preview or manually, depending on the template on which your document is based. There is a distinction between the following situations here:

If the real-time preview is available in your document, the icon is displayed in the document editor formula bar. If you click the button, the real-time preview is refreshed and all changes are applied automatically.

If the real-time preview is not available in your document, the document editor shows that the view does not indicate the editing status in the editing bar and in a black overlay:
You can trigger the page refresh either in the formula bar or overlay, and can also do so for all of the pages if the INDD document has multiple pages. If you click the arrow keys in the overlay, the overlay is minimized to a red exclamation point.