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"Hide Inaccessible Scheduled Issues" feature is by default set on "Yes". This allows to keep unnecessary clutter away and is especially recommended in busy environments, where multiple of users deal with great number of scheduled issues.
If you turn this %20-%20Inaccessible%20Scheduled%20Issues%20set%20as%20invisible%20for%20users%20with%20which%20SI%20is%20not%20shared.png?version=1&modificationDate=1546507475851&cacheVersion=1&api=v2&width=1058)
Contrary to the below presented graphic, this one displays only one issue (which was shared and because of that it's accessible and user is able to execute it and perform other actions hidden under "More" link)
If you turn in the Scheduler settings, "Hide Inaccessible Scheduled Issues" option to "No" and press save, then you can expect similar outcome in Scheduled Issues table (as presented below), whilst being logged as a user with whom not all of the issues displayed are shared:
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