diff --git a/src/slic3r/GUI/GLCanvas3D.cpp b/src/slic3r/GUI/GLCanvas3D.cpp
index 248d7368d..4fba8009a 100644
--- a/src/slic3r/GUI/GLCanvas3D.cpp
+++ b/src/slic3r/GUI/GLCanvas3D.cpp
@@ -896,7 +896,11 @@ void GLCanvas3D::Selection::add(unsigned int volume_idx, bool as_single_selectio
     if (needs_reset)
         clear();
 
-    m_mode = volume->is_modifier ? Volume : Instance;
+    if (volume->is_modifier)
+        m_mode = Volume;
+    else if (!contains_volume(volume_idx))
+        m_mode = Instance;
+    // else -> keep current mode
 
     switch (m_mode)
     {
diff --git a/src/slic3r/GUI/GUI_ObjectSettings.hpp b/src/slic3r/GUI/GUI_ObjectSettings.hpp
index 3e72713bf..12115e208 100644
--- a/src/slic3r/GUI/GUI_ObjectSettings.hpp
+++ b/src/slic3r/GUI/GUI_ObjectSettings.hpp
@@ -2,6 +2,7 @@
 #define slic3r_GUI_ObjectSettings_hpp_
 
 #include <memory>
+#include <vector>
 #include <wx/panel.h>
 
 class wxBoxSizer;
diff --git a/src/slic3r/GUI/ImGuiWrapper.cpp b/src/slic3r/GUI/ImGuiWrapper.cpp
index 7f95b6c28..78a3f9db8 100644
--- a/src/slic3r/GUI/ImGuiWrapper.cpp
+++ b/src/slic3r/GUI/ImGuiWrapper.cpp
@@ -239,10 +239,19 @@ bool ImGuiWrapper::checkbox(const wxString &label, bool &value)
     return ImGui::Checkbox(label_utf8.c_str(), &value);
 }
 
+void ImGuiWrapper::text(const char *label)
+{
+    ImGui::Text(label, NULL);
+}
+
+void ImGuiWrapper::text(const std::string &label)
+{
+    this->text(label.c_str());
+}
+
 void ImGuiWrapper::text(const wxString &label)
 {
-    auto label_utf8 = into_u8(label);
-    ImGui::Text(label_utf8.c_str(), NULL);
+    this->text(into_u8(label).c_str());
 }
 
 
@@ -267,6 +276,24 @@ bool ImGuiWrapper::combo(const wxString& label, const std::vector<wxString>& opt
     return false;
 }
 
+bool ImGuiWrapper::combo(const wxString& label, const std::vector<std::string>& options, std::string& selection)
+{
+    // this is to force the label to the left of the widget:
+    text(label);
+    ImGui::SameLine();
+    
+    if (ImGui::BeginCombo("", selection.c_str())) {
+        for (const std::string& option : options) {
+            bool is_selected = (selection.empty()) ? false : (option == selection);
+            if (ImGui::Selectable(option.c_str(), is_selected))
+                selection = option;
+        }
+        ImGui::EndCombo();
+        return true;
+    }
+    return false;
+}
+
 void ImGuiWrapper::disabled_begin(bool disabled)
 {
     wxCHECK_RET(!m_disabled, "ImGUI: Unbalanced disabled_begin() call");
diff --git a/src/slic3r/GUI/ImGuiWrapper.hpp b/src/slic3r/GUI/ImGuiWrapper.hpp
index 2cadc773c..333b66ed4 100644
--- a/src/slic3r/GUI/ImGuiWrapper.hpp
+++ b/src/slic3r/GUI/ImGuiWrapper.hpp
@@ -57,7 +57,10 @@ public:
     bool input_double(const std::string &label, const double &value, const std::string &format = "%.3f");
     bool input_vec3(const std::string &label, const Vec3d &value, float width, const std::string &format = "%.3f");
     bool checkbox(const wxString &label, bool &value);
+    void text(const char *label);
+    void text(const std::string &label);
     void text(const wxString &label);
+    bool combo(const wxString& label, const std::vector<std::string>& options, std::string& current_selection);
     bool combo(const wxString& label, const std::vector<wxString>& options, wxString& current_selection);
 
     void disabled_begin(bool disabled);
diff --git a/src/slic3r/GUI/KBShortcutsDialog.hpp b/src/slic3r/GUI/KBShortcutsDialog.hpp
index c5f60f0b8..d8905e1ce 100644
--- a/src/slic3r/GUI/KBShortcutsDialog.hpp
+++ b/src/slic3r/GUI/KBShortcutsDialog.hpp
@@ -3,6 +3,7 @@
 
 #include <wx/wx.h>
 #include <map>
+#include <vector>
 
 namespace Slic3r { 
 namespace GUI {
diff --git a/src/slic3r/GUI/Plater.cpp b/src/slic3r/GUI/Plater.cpp
index 8bee0b35e..dccfa61a8 100644
--- a/src/slic3r/GUI/Plater.cpp
+++ b/src/slic3r/GUI/Plater.cpp
@@ -2001,9 +2001,6 @@ void Plater::priv::schedule_background_process()
     this->background_process_timer.Start(500, wxTIMER_ONE_SHOT);
     // Notify the Canvas3D that something has changed, so it may invalidate some of the layer editing stuff.
     this->view3D->get_canvas3d()->set_config(this->config);
-    // Reset gcode preview
-    this->preview->get_canvas3d()->reset_volumes();
-    this->preview->get_canvas3d()->reset_legend_texture();
 }
 
 void Plater::priv::update_print_volume_state()