cover image hero content not replacable

Hello Sujapati, I try to change hero content. I want to make the pattern less high. Therefore I uploaded an image that is smaller than the theme cover image. It seems that the cover image isn't replacable by a new image. The original cover is always visible after choosing a new cover image. I made a screen image. Also it looks that it isn't possible to make the pattern hero content less high. Maybe I make mistakes and can you tell me how I can replace the original cover image and make the pattern less high. Kind regards Hans Hagmeijer