OnlyOffice Desktop Editors Title Bar

Problem

OnlyOffice Desktop Editors draws its own title bar, which prevents the window manager from displaying its usual context menu (sending to another desktop, keeping on top, shading...).

Solution

Modify the application's .desktop file to add the --system-title-bar parameter.
 

Procedure

Copy the system .desktop file to your home directory:

Open the copied file, modify the Exec= line, and save.

Exec=/usr/bin/onlyoffice-desktopeditors --system-title-bar %U

The change will take effect the next time OnlyOffice is launched.

Note This local file takes precedence over the system file without modifying it, and survives OnlyOffice updates.