I just started playing again and forgot how large the default warning Icons are.
I forgot how I changed it last time so I am posting this for my memory when I inevitably forget after the next update
1. Go to the following folder (if Steam install)
C:\Program Files (x86)\Steam\steamapps\common\Factorio\data\core\graphics\icons\alerts
2. Open the alert icon of your choice in any image editor (paint.net in my case)
3. Resize the [IMAGE] not the [CANVAS] and move it to the corner of your choice. 4. Save the file.
5. Start Factorio & enjoy.

