Hi BluePhantom, welcome to the forums. Unfortunately, events that are marked as "all day" will always be center-aligned. I'm planning to improve the calendar appearance settings to allow alignment to be specified. I'll post a reply when this improvement is completed.
In the meantime, I've attached a modified appearance theme which will do what you want.
To use this theme, unzip it to the "C:\Program Files\VueSoft\VueMinder" folder and then use the "Options -> Appearance" command in VueMinder to select the theme file.
I hope that helps. Please let me know if you have any other questions or suggestions.