With the libreoffice-kde.x86_64 1:126.96.36.199-1 installed the main menu does not display in kde. When the library is removed, the menu appears just fine.
Thanks for Looking into this
I observed that the problem exists mainly when opening new document. When I open existing file the menus appear fine and Libre Office does not hang.
*** This bug has been marked as a duplicate of bug 1085916 ***