In Qlik Sense, widget embedded in an iFrame as part of a sheet does not have a possibility to be toggled to full screen.
But this feature is available to widget when an application is opened in the hub
Environment
- Qlik Sense Enterprise (all versions)
Resolution
This is a known limitation.
The improvement bug QLIK-62886 was closed by R&D as WON'T FIX.
In addition, as per this article, R&D will not implement new features for the widget.
"Creating new widgets, editing existing widgets, and widget use will no longer be supported in Qlik Sense on Windows beginning with the August 2021 release"
We would recommend starting using extensions instead of Widgets knowing that extensions require coding (ex: JavaScripts) skills.