I found another place that dives a little deeper into Permissions... go to Administration/Permissions... there, use the "Advanced role override" drop-down to look at the current role you're looking for and a huge list with radio buttons will appear. There you can CTRL-F to find a keyword (I used view and hidden) and toggled some of the permissions there. You can also type the keyword in the "filter" box.
Roles and permissions
Permission for viewing conditionally restricted activities
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