we noticed some differences in the white ribbon theme to version used in Office 2019.
Firstly the application button is not colorized. I managed to achieve the desired result by duplicating and adpating the style from your sources. But I would suggest that the colors of the application button can be changed separately from the normal tabs.
But I am stuck with the second issue. In Office there is a border between the title bar and the tabs. I can only add a border under the tab buttons, but not above like it is in Office. Is there a way to achieve the same look like in Office 2019?
Best regards, Tobias Lingemann.