Night Sight is one of the best features of the Google Camera, yet it's not easily accessible - you have to go into the More screen (or wait for the automatic suggestion to show up). That will change with the next version of the app (v6.3), which leaked as part of the upcoming Android Q beta build. Night Sight replaces the Panorama mode from the main selector, so now it goes Night Sight, Portrait, Camera, Video and More. The Panorama is inside the More screen, where Night Sight used to be. Night Sight is now on the main screen Panorama mode was demoted Screen flash feature...
Source: https://www.gsmarena.com/new_google_camera_version_will_put_night_sight_mode_on_the_main_screen-news-37948.php