Hello Instant Apps Team,
We recently noticed an issue with specifically the Sidebar Instant App. When viewing the application's configured bookmarks on a mobile device, the map centers behind the bookmark window. Because if this behavior, users are not able to see the area they just selected, this leads to user confusion/user error.
Screenshot of the issue:

In the screenshot above, the bookmark has been configured in the web map to show the entire parking area. When viewing it on a mobile device, the parking area is hidden behind the bookmark window.
Please resolve this issue as this impacts our current and future planned projects in this application.
Thank you,
Amanda Huber