All themes look like this on 4k:
Theme uploads are limited to 3000 pixels wide. Until that changes you are likely to see that with a lot of designs unless designers try to blend the left edge into the background color they choose so that there isn’t an abrupt cut off of the design.
Thanks! Who had such great idea to limit to 3000 pixels?
I believe that at the time that they were implemented, the majority of screen resolutions were a good bit smaller.
Does anyone know if there is a way to manually edit the theme and change the backgroud colour so that it blends better?