Edit theme page does not have any customization settings right now. But this can be easily achieved by changing the base.css file by adding certain comments to the elements you want, After adding those controller comments you'll be able to change almost all elements via Edit theme page, like background color, header image, icons, other elements color etc. I can provide you the exact instructions in order to achieve that.
The view of the events listing can also be changed, but this can be done as a part of the customization and for some additional fee only.
As after chaning the layout of the events for desktop view, you'll need to change it for mobile and tablet view as well and this is a lot of work
As to the size of the header it also can be changed via CSS, the workaround is fairly easy, this can be done for free.
To sum up:
edit theme change - exact instructions - free of charge as this will be added in the upcoming update of the theme as well.
events listings layout - paid customization
header size - free of charge.
Thank you for the interest in my themes.