diff --git a/src/libslic3r/Config.hpp b/src/libslic3r/Config.hpp
index fdf00c2d0..ff5563226 100644
--- a/src/libslic3r/Config.hpp
+++ b/src/libslic3r/Config.hpp
@@ -91,9 +91,7 @@ enum ConfigOptionType {
 enum ConfigOptionMode {
     comSimple = 0,
     comAdvanced,
-    comExpert,
-
-    comUndef
+    comExpert
 };
 
 enum PrinterTechnology : unsigned char
diff --git a/src/slic3r/GUI/Tab.cpp b/src/slic3r/GUI/Tab.cpp
index aeb520d09..a9439d339 100644
--- a/src/slic3r/GUI/Tab.cpp
+++ b/src/slic3r/GUI/Tab.cpp
@@ -735,9 +735,6 @@ void Tab::update_mode()
 
 void Tab::update_visibility()
 {
-    if (m_mode == comUndef) // if mode isn't set for this moment
-        m_mode = wxGetApp().get_mode();
-
     Freeze(); // There is needed Freeze/Thaw to avoid a flashing after Show/Layout
 
     for (auto page : m_pages)
diff --git a/src/slic3r/GUI/Tab.hpp b/src/slic3r/GUI/Tab.hpp
index 3aa183540..efefc47c5 100644
--- a/src/slic3r/GUI/Tab.hpp
+++ b/src/slic3r/GUI/Tab.hpp
@@ -218,7 +218,7 @@ protected:
     int                 m_em_unit;
     // To avoid actions with no-completed Tab
     bool                m_complited { false };
-    ConfigOptionMode    m_mode = comUndef;
+    ConfigOptionMode    m_mode = comExpert; // to correct first Tab update_visibility() set mode to Expert
 
 public:
 	PresetBundle*		m_preset_bundle;