Created attachment 77710 [details]
Image to further clarify.
In any libreoffice program the toolbar dropdown menus buttons top, right and bottom side does not get the same colour as the theme applied.
using Writer, looking at "apply style", "font name" and "font size".
Apply a dark theme.
Observe how each dropdown box will have a slight white box around them on its right hand part, on the sides of the button to click to expand the menu.
See the red arrow in the picture attached.
the small area surrounding the button to also adhere to the personas theme.
Created attachment 77711 [details]
Image to further clarify
*** This bug has been marked as a duplicate of bug 51047 ***