I might not be fully awake, but it seems to me the operator should be “and”, not “or”:
if ( ! is_single() && ! is_page( 'about' ) ) {
get_sidebar();
}
The is_single() checks if the main query is for a single post, and is_page() checks if the main query is for a specified page.
Because you don’t want the sidebar to show on single posts, exclude that by ! is_single(), which leaves you with all other content types except posts. From there, we also want to prevent display on the about page, so add ! is_page( 'about' ) to allow other pages but not the about page.
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