The KendoUI Editor for jQuery exposes a stylesheets property that allows the default stylesheet to be defined for the editor. Please add this property to the KendoUI Editor for Vue as well as I would like to be able to set some default css properties such as font family, font size, colors, etc.
The list of stylesheets can be attached after the currently included stylesheets which would allow overriding any default Kendo or ProseMirror specific styles.
Reference: https://www.telerik.com/kendo-jquery-ui/documentation/api/javascript/ui/editor/configuration/stylesheets
As an alternative, you can apply custom CSS (such as font family, font size, and colors) to the Editor's iframe content, you can use the onLoaded event. With this event, you can inject a <style> element or a <link> to an external stylesheet into the iframe's document, allowing you to override default Kendo or ProseMirror styles.