Qt Charts and Data Visualization widgets
I am interested in trying non-commercial version of Qt Charts and Qt Data Visualization.
Therefore, I have installed Qt 5.7, but I cannot find new widgets neither in Qt Designer nor in Qt Creator.
Any suggestions what should I do so new widgets appear in designer?
There are no new widgets in Qt Designer.
You have to write the code (e.g. QChartView, QLineSeries) in Qt Creator.
To start with it, show at onme example and look at the code. Then you will see that it is not difficult.
Hope this helps.
To add to what @HenrikSt said, you can use Qt Designer to add a QChartView to your form: In Designer, just add a QWidget to your form and promote it to QChartView (as described in Using Custom Widgets with Qt Designer).