The Option Pages for me are looking too much like a post edit page. On the right is the sidebar box with the save button and if there are many options the space beneath the side is a wasted area.

With some changes to the layout the Option Pages could look more like they should be. I placed the save button to the top and bottom, so you don’t have to scroll up to save changes if you on the last option.

O.k. – you don’t have the possibility to place an option field group into the sidebar and the settings for Option Pages should be changed. But I think most of the ACF users doesn’t use this option.
By the way I looked for the possibility to change the text of the save button, which could be done by changing a little bit of the code to use the option page title. The same would be great if the notice not ever is called “Options saved”; instead I changed this to use the option page title here as well.
What do you think of these changes to the Option Pages.
Would it be possible at least to be able to override the CSS class settings on #post-body to use class “columns-1” for options pages? Is there any simple way that I can override that? For example, can I not use the WordPress filter screen_layout_columns? – but what would the value of the $column index be?
I didn’t find any hints how to do this anywhere, unfortunately.