"Build Settings / CMake / Initial CMake parameters":
(separately for debug and release)
(clear previos config "Clear CMake Configuration", "Run CMake")

for Coin3D
-DBOOST_ROOT:STRING=C:/Users/Victor/Neo/Programming/Qt/Projects/Boost/boost_1_72_0
-DCMAKE_INSTALL_PREFIX:PATH=C:/Users/Victor/Neo/Programming/Qt/Libraries/Coin/Coin3D-qt6-mingw-release

for SoQt
-DBOOST_ROOT:STRING=C:/Users/Victor/Neo/Programming/Qt/Projects/Boost/boost_1_72_0
-DCMAKE_INSTALL_PREFIX:PATH=C:/Users/Victor/Neo/Programming/Qt/Libraries/Coin/Coin3D-qt6-mingw-release
-DCoin_DIR:PATH=C:/Users/Victor/Neo/Programming/Qt/Libraries/Coin/Coin3D-qt6-mingw-release/lib/cmake/Coin-4.0.1

"Build Steps / Targets":
all + install