It looks like that is a type of Grid. Grid components of applications have a lot of parts to them that are not immediately visible to TestComplete and require the test developer to utilize other methods and properties to interact with the contents of the grid.
That said, in researching this a little further, I found the list of extended support QT components (https://support.smartbear.com/testcomplete/docs/reference/test-objects/controls/desktop/qt/index.html). QScrollarea (if that's the component) is not listed. This does not mean you can't interact with it or make use of the control, it just means that you'll have to do a bit more in the way of custom script code work in order to interact with the contents of the control.