I would like to know is there anyway that I can change the post layout in author page from Masonry to Left(large) like the blog and categories page setting.
Masonry layout in author page incorrectly measure the height of each post. It bring a huge gap between post (top and bottom)
If you are not a developer then you can consider hiring a developer to develop it for you. You can hire a developer from any freelance site. Shufflehound recommends the developer https://www.upwork.com/freelancers/~011652ffec8865c6d5