Answer
The ‘Save for Web’ (CTRL+SHIFT+ALT+S) feature gives much more options, including creating export presets, saving the image at scale, clipping to artboard, etc.
If you prefer using the ‘Export’ option, normally it should remember the last setting you used (it does on my machine). Try resetting the AI preferences by holding CTRL+SHIFT+ALT (Windows) as you re-start Illustrator.
Attribution
Source : Link , Question Author : Safetyman , Answer Author : Lucian