diff --git a/src/libslic3r/SLAPrint.cpp b/src/libslic3r/SLAPrint.cpp
index 7dc920517..809b32d90 100644
--- a/src/libslic3r/SLAPrint.cpp
+++ b/src/libslic3r/SLAPrint.cpp
@@ -1041,31 +1041,37 @@ void SLAPrint::process()
                 {
                     ClipperPolygon poly;
 
+                    // We need to reverse if flpXY OR is_lefthanded is true but
+                    // not if both are true which is a logical inequality (XOR)
+                    bool needreverse = flpXY != is_lefthanded;
+
                     // should be a move
                     poly.Contour.reserve(polygon.contour.size() + 1);
 
-                    for(auto& p : polygon.contour.points)
-                        poly.Contour.emplace_back(p.x(), p.y());
-
-                    auto pfirst = poly.Contour.front();
-                    poly.Contour.emplace_back(pfirst);
+                    auto& cntr = polygon.contour.points;
+                    if(needreverse)
+                        for(auto it = cntr.rbegin(); it != cntr.rend(); ++it)
+                            poly.Contour.emplace_back(it->x(), it->y());
+                    else
+                        for(auto& p : cntr)
+                            poly.Contour.emplace_back(p.x(), p.y());
 
                     for(auto& h : polygon.holes) {
                         poly.Holes.emplace_back();
                         auto& hole = poly.Holes.back();
                         hole.reserve(h.points.size() + 1);
 
-                        for(auto& p : h.points) hole.emplace_back(p.x(), p.y());
-                        auto pfirst = hole.front(); hole.emplace_back(pfirst);
+                        if(needreverse)
+                            for(auto& p : h.points)
+                                hole.emplace_back(p.x(), p.y());
+                        else
+                            for(auto it = h.points.rbegin(); it != h.points.rend(); ++it)
+                                hole.emplace_back(it->x(), it->y());
                     }
 
                     if(is_lefthanded) {
                         for(auto& p : poly.Contour) p.X = -p.X;
-                        std::reverse(poly.Contour.begin(), poly.Contour.end());
-                        for(auto& h : poly.Holes) {
-                            for(auto& p : h) p.X = -p.X;
-                            std::reverse(h.begin(), h.end());
-                        }
+                        for(auto& h : poly.Holes) for(auto& p : h) p.X = -p.X;
                     }
 
                     sl::rotate(poly, double(instances[i].rotation));
@@ -1074,12 +1080,7 @@ void SLAPrint::process()
 
                     if (flpXY) {
                         for(auto& p : poly.Contour) std::swap(p.X, p.Y);
-                        std::reverse(poly.Contour.begin(), poly.Contour.end());
-
-                        for(auto& h : poly.Holes) {
-                            for(auto& p : h) std::swap(p.X, p.Y);
-                            std::reverse(h.begin(), h.end());
-                        }
+                        for(auto& h : poly.Holes) for(auto& p : h) std::swap(p.X, p.Y);
                     }
 
                     polygons.emplace_back(std::move(poly));
diff --git a/src/slic3r/GUI/GUI_ObjectManipulation.cpp b/src/slic3r/GUI/GUI_ObjectManipulation.cpp
index 6c8fdcab7..61e98d542 100644
--- a/src/slic3r/GUI/GUI_ObjectManipulation.cpp
+++ b/src/slic3r/GUI/GUI_ObjectManipulation.cpp
@@ -179,7 +179,7 @@ void ObjectManipulation::update_settings_value(const Selection& selection)
                 changed_box = true;
             }
             if (changed_box || !m_cache.instance.matches_instance(instance_idx) || !m_cache.scale.isApprox(100.0 * m_new_scale))
-                m_new_size = volume->get_instance_transformation().get_matrix(true, true) * m_cache.instance.box_size;
+                m_new_size = (volume->get_instance_transformation().get_matrix(true, true) * m_cache.instance.box_size).cwiseAbs();
         }
         else
             // this should never happen
@@ -209,7 +209,7 @@ void ObjectManipulation::update_settings_value(const Selection& selection)
         m_new_position = volume->get_volume_offset();
         m_new_rotation = volume->get_volume_rotation();
         m_new_scale    = volume->get_volume_scaling_factor();
-        m_new_size = volume->get_volume_transformation().get_matrix(true, true) * volume->bounding_box.size();
+        m_new_size = (volume->get_volume_transformation().get_matrix(true, true) * volume->bounding_box.size()).cwiseAbs();
         m_new_enabled = true;
     }
     else if (wxGetApp().obj_list()->multiple_selection())
diff --git a/src/slic3r/GUI/Gizmos/GLGizmoSlaSupports.cpp b/src/slic3r/GUI/Gizmos/GLGizmoSlaSupports.cpp
index 75f13cdcf..5be7f9100 100644
--- a/src/slic3r/GUI/Gizmos/GLGizmoSlaSupports.cpp
+++ b/src/slic3r/GUI/Gizmos/GLGizmoSlaSupports.cpp
@@ -565,12 +565,12 @@ void GLGizmoSlaSupports::on_render_input_window(float x, float y, float bottom_l
 RENDER_AGAIN:
     m_imgui->set_next_window_pos(x, y, ImGuiCond_Always);
 
-    const ImVec2 window_size(m_imgui->scaled(15.f, 16.5f));
+    const ImVec2 window_size(m_imgui->scaled(17.f, 18.f));
     ImGui::SetNextWindowPos(ImVec2(x, y - std::max(0.f, y+window_size.y-bottom_limit) ));
     ImGui::SetNextWindowSize(ImVec2(window_size));
 
     m_imgui->set_next_window_bg_alpha(0.5f);
-    m_imgui->begin(on_get_name(), ImGuiWindowFlags_NoMove | ImGuiWindowFlags_NoResize | ImGuiWindowFlags_NoCollapse);
+    m_imgui->begin(on_get_name(), ImGuiWindowFlags_NoMove | ImGuiWindowFlags_AlwaysAutoResize | ImGuiWindowFlags_NoCollapse);
 
     ImGui::PushItemWidth(100.0f);