Export tab on lower right has disappear. I have no idea why. If I click on the image the import to photos is grayed out.
The export button is part of the film strip in Customize view. Hide the film strip and the button seemingly disappears. Unhide the film strip and the button should show again.
If your issue exist in different conditions, we need to know more about the viw you use, version numbers etc…and a screen capture can help too.
Got it back. The Export button is 'Blue" again. It was because the the images I was trying to export had the red light button on.