diff --git a/src/slic3r/GUI/Plater.cpp b/src/slic3r/GUI/Plater.cpp
index 14562a20d..8ada186f4 100644
--- a/src/slic3r/GUI/Plater.cpp
+++ b/src/slic3r/GUI/Plater.cpp
@@ -788,7 +788,9 @@ Sidebar::Sidebar(Plater *parent)
 
     p->sizer_filaments = new wxBoxSizer(wxVERTICAL);
 
-    auto init_combo = [this](PlaterPresetComboBox **combo, wxString label, Preset::Type preset_type, bool filament) {
+    const int margin_5 = int(0.5 * wxGetApp().em_unit());// 5;
+
+    auto init_combo = [this, margin_5](PlaterPresetComboBox **combo, wxString label, Preset::Type preset_type, bool filament) {
         auto *text = new wxStaticText(p->presets_panel, wxID_ANY, label + " :");
         text->SetFont(wxGetApp().small_font());
         *combo = new PlaterPresetComboBox(p->presets_panel, preset_type);
@@ -803,9 +805,19 @@ Sidebar::Sidebar(Plater *parent)
         auto *sizer_filaments = this->p->sizer_filaments;
         sizer_presets->Add(text, 0, wxALIGN_LEFT | wxEXPAND | wxRIGHT, 4);
         if (! filament) {
-            sizer_presets->Add(combo_and_btn_sizer, 0, wxEXPAND | wxBOTTOM, 1);
+            sizer_presets->Add(combo_and_btn_sizer, 0, wxEXPAND | 
+#ifdef __WXGTK3__
+                wxRIGHT, margin_5);
+#else
+                wxBOTTOM, 1);
+#endif // __WXGTK3__
         } else {
-            sizer_filaments->Add(combo_and_btn_sizer, 0, wxEXPAND | wxBOTTOM, 1);
+            sizer_filaments->Add(combo_and_btn_sizer, 0, wxEXPAND |
+#ifdef __WXGTK3__
+                wxRIGHT, margin_5);
+#else
+                wxBOTTOM, 1);
+#endif // __WXGTK3__
             (*combo)->set_extruder_idx(0);
             sizer_presets->Add(sizer_filaments, 1, wxEXPAND);
         }
@@ -818,13 +830,15 @@ Sidebar::Sidebar(Plater *parent)
     init_combo(&p->combo_sla_material,  _L("SLA material"),       Preset::TYPE_SLA_MATERIAL,  false);
     init_combo(&p->combo_printer,       _L("Printer"),            Preset::TYPE_PRINTER,       false);
 
-    const int margin_5  = int(0.5*wxGetApp().em_unit());// 5;
-
     p->sizer_params = new wxBoxSizer(wxVERTICAL);
 
     // Frequently changed parameters
     p->frequently_changed_parameters = new FreqChangedParams(p->scrolled);
-    p->sizer_params->Add(p->frequently_changed_parameters->get_sizer(), 0, wxEXPAND | wxTOP | wxBOTTOM, wxOSX ? 1 : margin_5);
+    p->sizer_params->Add(p->frequently_changed_parameters->get_sizer(), 0, wxEXPAND | wxTOP | wxBOTTOM
+#ifdef __WXGTK3__
+        | wxRIGHT
+#endif // __WXGTK3__
+        , wxOSX ? 1 : margin_5);
 
     // Object List
     p->object_list = new ObjectList(p->scrolled);
@@ -852,12 +866,19 @@ Sidebar::Sidebar(Plater *parent)
     // Sizer in the scrolled area
     if (p->mode_sizer)
         scrolled_sizer->Add(p->mode_sizer, 0, wxALIGN_CENTER_HORIZONTAL);
+
+#ifdef __WXGTK3__
+    wxDirection size_margin = wxLEFT | wxRIGHT;
+#else
+    wxDirection size_margin = wxLEFT;
+#endif // __WXGTK3__
+
     is_msw ?
-        scrolled_sizer->Add(p->presets_panel, 0, wxEXPAND | wxLEFT, margin_5) :
-        scrolled_sizer->Add(p->sizer_presets, 0, wxEXPAND | wxLEFT, margin_5);
-    scrolled_sizer->Add(p->sizer_params, 1, wxEXPAND | wxLEFT, margin_5);
-    scrolled_sizer->Add(p->object_info, 0, wxEXPAND | wxTOP | wxLEFT, margin_5);
-    scrolled_sizer->Add(p->sliced_info, 0, wxEXPAND | wxTOP | wxLEFT, margin_5);
+        scrolled_sizer->Add(p->presets_panel, 0, wxEXPAND | size_margin, margin_5) :
+        scrolled_sizer->Add(p->sizer_presets, 0, wxEXPAND | size_margin, margin_5);
+    scrolled_sizer->Add(p->sizer_params, 1, wxEXPAND | size_margin, margin_5);
+    scrolled_sizer->Add(p->object_info, 0, wxEXPAND | wxTOP | size_margin, margin_5);
+    scrolled_sizer->Add(p->sliced_info, 0, wxEXPAND | wxTOP | size_margin, margin_5);
 
     // Buttons underneath the scrolled area
 
@@ -975,7 +996,12 @@ void Sidebar::init_filament_combo(PlaterPresetComboBox **combo, const int extr_i
                             int(0.3*wxGetApp().em_unit()));
 
     auto /***/sizer_filaments = this->p->sizer_filaments;
-    sizer_filaments->Add(combo_and_btn_sizer, 1, wxEXPAND | wxBOTTOM, 1);
+    sizer_filaments->Add(combo_and_btn_sizer, 1, wxEXPAND |
+#ifdef __WXGTK3__
+        wxRIGHT, margin_5);
+#else
+        wxBOTTOM, 1);
+#endif // __WXGTK3__
 }
 
 void Sidebar::remove_unused_filament_combos(const size_t current_extruder_count)