As you are not able to see the Minimize, Restore and Maximize tabs on top, you can try reinstalling Lightroom and No you will not lose your presets and catalog.
Try pressing Shift+F once or twice.
1 person found this helpful
I did reinstall Lightroom 2015.10 from the Adobe Creative Cloud panel (and checking "No, keep app preferences"). The reinstalled product still does not have the Minimize, Restore and Maximize icons. Here is what the top right of my Lightroom looks like:
For comparison, here is what the top right of my Photoshop looks like, with the icons that are missing in my Lightroom.
2 people found this helpful
Your screenshot seems to indicate that you are in Full screen mode with menubar, so pressing Shift+F twice should restore the top right buttons.
Many thanks for the quick, accurate help!!
This was the problem that I had today. As suggested, I pressed Shift+F twice. Ta-da, all fixed. Thank you.