Reminiscience Overwrite Mac OS
The keyboard layout on Apple computers is special and some keys are missing. For example there is no Insert key to toggle between insert and overtype. LibreOffice supports the function and you can switch by clicking the respective panel on the status bar.
Figure 1: Status bar panel in Writer to switch between insert and overwrite.

But the question remains if we should introduce a shortcut for users who prefer not to grab the mouse (see ticket tdf#107918 on Bugzilla). The most common way is FN+Enter but some applications use less easy reachable combinations like Ctrl+Cmd+O to avoid accidentally key press. In any case the shortcut would be hard coded and not be customizable. What do you think (please enable Polldaddy)?
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By the way, Microsoft Word on macOS provides an option in the preference dialog for this.
Reminiscence Overwrite Mac Os Catalina
If you use Option-Command-R during startup, in most cases you're offered the latest macOS that is compatible with your Mac. Otherwise you're offered the macOS that came with your Mac, or the closest version still available. If the Mac logic board was just replaced, you may be offered only the latest macOS that is compatible with your Mac. On Mac OS X, when I am upgrading any application that is running, the upgrade program asks for the application be shut down completely for the upgrade to proceed, in some cases, it proceeds but upgrades don't take effect until application restart. It would sometimes list out the names of libraries being in use which are causing the upgrade to. #1 Recover Overwritten Files on a Mac with Time Machine If you follow best practices you should be performing regular backups of your Mac. Time Machine, the backup and recovery tool that is part of macOS, provides an easy way to protect your data for just this type of occasion.