I am playing the role of an admin for a couple of Login companies and I am unable to view the "Show All Scheduled Reports" option when accessing "Components -> Scheduled Reports".
It seems that your account doesn't have the Product Admin access to Analytics. All the Analytics admins get the checkbox "Show All Scheduled Reports" as shown below.
So, suggest you to go to URL: https://adminconsole.adobe.com/ & then navigate to Users tab to get the Product Admin access to Analytics. In case, if you are not able to access this link then you will need to check with the System Admins in your organization to get the Product Admin access to Analytics.