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I figured out the answer to this question and why there was no connection between SIGNAL and SLOT and wanted to share in case someone has my same problem. The small issue was the different notation between C++11 and C++17 and about my question the correct answer is the notation below:

QObject::connect( topViewBtn1, &QPushButton::clicked, [this](){
    switchToTopView(QString("Top View"));
});

As also explained here I hope this could be helpful for others.