Fullscreen, maximise and minimise buttons not showing in applications

Hello everyone! I am currently using the sweet ambar blue dark gtk theme and as displayed below in the screenshot, fullscreen maximise and minimise buttons are not showing up in the Nautilus window (only showing in tweaks and some other applications). Help much appreciated, thanks.
Attached: screenshot with the issue.

Just a hazard, but I think it’s so by design… try different themes maybe?