I'll add to my post in case this is a better question: We have a site using Restrict Access based upon groups for viewing resources and doing activities. A student in one group is completing all of the available activities, but the course completion is telling them they are not complete. We think this is because that can't get to the content we have prevented them from seeing. Is there a way to have Completion Tracking respect what we have set through Restrict Access? Otherwise, I have to get this progress bar turned off for the students. We used the CSS trick in the browser, but the app is showing it and alarming the students. Thanks.

For posterity: we finally resolved this by signing up for the Premium app. I created a {moodle root}/local/mobile.css file and referenced it with the mobilecssurl setting. Because there's no real documentation on how to target specific components and the example themes do not discuss the progress bar, I had to repeatedly rename the URL by appending a version hash "#1" "#2" etc to it to keep trying new CSS approaches. It seemed like you also had to log out and back in to see the fresh styles. Finally, this CSS worked:

.core-progress-bar
progress,
.core-progress-text {
display: none !important;
}

I'm not sure how much of that is necessary but this was the first thing that actually worked. The Moodle Mobile Themes doc is useful but doesn't list all the components or how target them with selectors, so I looked at the mobile app's github repo to figure that out.