You are starting it in Debug mode, which means it will not allow for the restart button.
/etc/zope.conf (edit debug mode)
Also, try running it with:
/bin/zopectl start &
I don't think that debug mode has anything to do with it. Rather, if you're using "runzope" it's not running in daemon mode, and so cannot restart. Run it as a service with 'zopectl start' and you'll have a "Restart" button.
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