As seen at Does QtCreator support code thumbnail like Kate or VS2022? there is a need to have a visual representation of the whole document in smaller size replacing the scrollbar as seen below:

There is also a survey at Do you use the code minimap in your editor of choice? - Hashnode

Here is a creative way of using ascii art to mark things in the minimap yKELiIR.jpg (815×1022) (imgur.com)

This is a feature that important that it produced two Qt Creator plugins:

1. i94matjo/qtcreator-minimap-plugin: Minimap scrollbar for qtcreator (github.com)
2. https://codereview.qt-project.org/c/qt-creator/qt-creator/+/288081

I think it would be useful if Qt Creator would provide the feature itself.