Thanks. I was able to resolve the issue. I looked into KWin System Settings
as suggested.

A feature in the latest version of KDE Plasma is to blame.
System Settings> Application Style> Fine Tuning> Menubar style> In
Application resolves it.

Regards
Karthik Tayur

On 9 July 2017 at 20:52, John Coppens <j...@jcoppens.com> wrote:

> On Sun, 9 Jul 2017 12:24:32 +0530
> Karthik Tayur <karthiksta...@gmail.com> wrote:
>
> > The menu bar has disappeared on LyX. I am using Arch Linux. I haven't
> > observed this happening on any of my other applications. My system is up
> to
> > date. Any idea as to what might have gone wrong?
>
> If you're using Unity:
>
> Older versions of unity 'grabbed' the menu bar of the active program
> and displayed it at the top of the screen (not window), but only if the
> cursor is there. Try moving the cursor to the top of the screen. I
> remember having to delete (or rename) an executable to restore 'normal'
> behaviour.
>
> Newer versions seem to have another system, which is configurable in a
> more practical way, and allow to auto-hide the menu. I believe this is
> a property of the window manager - not of LyX.
>
> John
>

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