diff --git a/qt6-after/qt6-migrated-legatus/Lts/Application/OpApp/main.cpp b/qt6-after/qt6-migrated-legatus/Lts/Application/OpApp/main.cpp
index 99c070c49..b83bea9c9 100755
--- a/qt6-after/qt6-migrated-legatus/Lts/Application/OpApp/main.cpp
+++ b/qt6-after/qt6-migrated-legatus/Lts/Application/OpApp/main.cpp
@@ -192,7 +192,7 @@ int main(int argc, char **argv) // TODO: json strings to lower
   NGLApplication app(argc, argv);
   app.createLogger("opApp");
   QApplication::setQuitOnLastWindowClosed(false); // we are cool enough to handle it ourselves 8)
-  QApplication::setAttribute(Qt::AA_UseHighDpiPixmaps);
+  // Qt::AA_UseHighDpiPixmaps: no-op since Qt6 (high-DPI pixmaps are always enabled)
   QNetworkProxy::setApplicationProxy(QNetworkProxy()); // do NOT use proxies anywhere!
 
   NGL::LoggerHandler *lh = NGL::LoggerHandler::getLoggerHandler();
diff --git a/qt6-after/qt6-migrated-legatus/Lts/Application/THP/SitMapReplayTest/srp_main.cpp b/qt6-after/qt6-migrated-legatus/Lts/Application/THP/SitMapReplayTest/srp_main.cpp
index 34268f7a8..900faea12 100755
--- a/qt6-after/qt6-migrated-legatus/Lts/Application/THP/SitMapReplayTest/srp_main.cpp
+++ b/qt6-after/qt6-migrated-legatus/Lts/Application/THP/SitMapReplayTest/srp_main.cpp
@@ -23,7 +23,7 @@ int main(int argc, char **argv)
   QNetworkProxy::setApplicationProxy(QNetworkProxy());
   NGLApplication app(argc, argv);
   app.createLogger("SRP");
-  app.setAttribute(Qt::AA_UseHighDpiPixmaps);
+  // Qt::AA_UseHighDpiPixmaps: no-op since Qt6 (high-DPI pixmaps are always enabled)
 
   SituationReplay::ConnectionParams connParams;
   connParams.domainId = 1;
diff --git a/qt6-after/qt6-migrated-legatus/Lts/Application/THP/main.cpp b/qt6-after/qt6-migrated-legatus/Lts/Application/THP/main.cpp
index 50cb9cfe9..4724e9e55 100755
--- a/qt6-after/qt6-migrated-legatus/Lts/Application/THP/main.cpp
+++ b/qt6-after/qt6-migrated-legatus/Lts/Application/THP/main.cpp
@@ -50,7 +50,7 @@ int main(int argc, char **argv)
   app.createLogger("THP", "log4cxx_thp_viewer.props");
   app.setOrganizationName(QStringLiteral("RME"));
   app.setApplicationName(QStringLiteral("thp_viewer"));
-  app.setAttribute(Qt::AA_UseHighDpiPixmaps);
+  // Qt::AA_UseHighDpiPixmaps: no-op since Qt6 (high-DPI pixmaps are always enabled)
 
   QDir::setSearchPaths(QLatin1String("icon"), QStringList(QLatin1String(":/style/")));
   Q_INIT_RESOURCE(rme_light_style);
diff --git a/qt6-after/qt6-migrated-legatus/Lts/Plugins/BuildingViewer/Common/BgViewer/viewerCtrl/visitors.cpp b/qt6-after/qt6-migrated-legatus/Lts/Plugins/BuildingViewer/Common/BgViewer/viewerCtrl/visitors.cpp
index ed9cc8db5..80105c241 100755
--- a/qt6-after/qt6-migrated-legatus/Lts/Plugins/BuildingViewer/Common/BgViewer/viewerCtrl/visitors.cpp
+++ b/qt6-after/qt6-migrated-legatus/Lts/Plugins/BuildingViewer/Common/BgViewer/viewerCtrl/visitors.cpp
@@ -4,7 +4,7 @@
 #include <osg/Material>
 #include <osg/BlendFunc>
 #include <osg/BlendColor>
-#include <QStringRef>
+#include <QStringView>
 #include <QtCore/QVector>
 
 namespace VCtrl
@@ -87,10 +87,10 @@ void SplitVisitor::apply(osg::Group &node)
     for (unsigned int i = 0; i < node.getNumDescriptions(); ++i)
     {
       QString descr = QString::fromStdString(node.getDescription(i));
-      const QVector<QStringRef> descprt = descr.splitRef(QLatin1Char(';'));
-      for (const QStringRef &prt : descprt)
+      const QVector<QStringView> descprt = QStringView(descr).split(QLatin1Char(';'));
+      for (const QStringView &prt : descprt)
       {
-        const QVector<QStringRef> items = prt.split(QLatin1Char('='));
+        const QVector<QStringView> items = prt.split(QLatin1Char('='));
         if (items.size() == 2 && items[0] == QLatin1String("base_height"))
           h = items[1].toFloat();
       }
diff --git a/qt6-after/qt6-migrated-legatus/Lts/Proxies/HighLevelArchitecture/Common/typestruct.cpp b/qt6-after/qt6-migrated-legatus/Lts/Proxies/HighLevelArchitecture/Common/typestruct.cpp
index 4a0c9fa2e..c467fedc2 100755
--- a/qt6-after/qt6-migrated-legatus/Lts/Proxies/HighLevelArchitecture/Common/typestruct.cpp
+++ b/qt6-after/qt6-migrated-legatus/Lts/Proxies/HighLevelArchitecture/Common/typestruct.cpp
@@ -23,7 +23,7 @@ TypeStruct::TypeStruct(const rpr2::EntityTypeStruct &eis)
 
 TypeStruct TypeStruct::fromString(const QString &string)
 {
-  const QVector<QStringRef> sl = string.splitRef(QLatin1Char('.'));
+  const QVector<QStringView> sl = QStringView(string).split(QLatin1Char('.'));
 
   TypeStruct ts;
   bool bOk;