JSmol view (using html5 canvas: use modern browser less than 5 years old, preferably chrome, firefox or edge p.s. unacceptably slow on Internet Explorer <=11) Antialiasing (ON: slower but better quality, OFF: faster. Move molecule to activate changes)
Black background 640x640
1024x1024
1280x1280
1920x1080 (HD)
1920x1920
Size (bigger size = slower)
Other options: use right mouse button over structure view (e.g. to save image use menu "File/Export/Export JPG image")