The setting for this is only at the user level, and it is stored in their browser level settings. If the user runs multiple browser tabs with Salesforce open, the pop-up is required to act as an anchor to the media as they tab-switch. For most users, only one browser tab is running Salesforce and they can disable this setting - but they must disable it themselves within their local settings. We've made this config change part of our training for new hires.
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Brad Murlin
Zillow, Inc.
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