I am running Evolution 3.40.3 on OpenSUSE Tumbleweed. Since I like the vertical view with Message Preview next to the Message List, horizontal space is at a premium for me. I have thought about turning off the sidebar with the folder list, but it is pretty convenient to have it up there.
Is there a way to reduce the indentation of each successive level of folders and/or eliminate or shrink the marginally useful folder icons and/or shrink the little triangles that show whether a folder with subfolders is expanded or not? Thanks for any advice to help me save horizontal space in this folder sidebar.