diff --git a/src/apps/muscles/MuscleWidgets.jl b/src/apps/muscles/MuscleWidgets.jl
index 21a81d04e8e0d699a4f4ddb14dd5d40e5b10abcf..e5577ed86345d7c58f1d200b59fb2ccd05e3ea1c 100644
--- a/src/apps/muscles/MuscleWidgets.jl
+++ b/src/apps/muscles/MuscleWidgets.jl
@@ -1,6 +1,5 @@
 module MuscleWidgets
 
-using Base: has_nondefault_cmd_flags
 using NyxWidgets.Players, NyxWidgets.Muscles, NyxWidgets.AnimatedLayers
 import NyxWidgets.Base: lowerdom, dom_id, dom_id!, Div
 using NyxPlots
diff --git a/src/apps/muscles/app.jl b/src/apps/muscles/app.jl
index b24ccc970093d408c5bd7e24ecb17515264c34e1..b1747ffe13f6e230ad6daefbdc9f7b0233fddf2a 100644
--- a/src/apps/muscles/app.jl
+++ b/src/apps/muscles/app.jl
@@ -37,6 +37,7 @@ const bonito_app = NamedApp(:inherit, Backbone.app)
     #@in delete_sequence_click = false
 
     @in colormap = default_colormap
+    @out first_time_in_editmode = true # and in the heatmap view
     @in editmode = false
     @out editmode_disable = true
     @in setvalue = 1.0
@@ -44,6 +45,8 @@ const bonito_app = NamedApp(:inherit, Backbone.app)
     @in time_interval = 0.05
     @in start_time = 0.0
 
+    @out heatmap_view = false
+
     @out area_selected = false
     @out new_clipboard_item = false
 
@@ -80,6 +83,12 @@ const bonito_app = NamedApp(:inherit, Backbone.app)
             area_selected[!] = false
             area_selected = true
         end
+        on(model.animation.switchlayer) do layers
+            if !isnothing(layers)
+                current = layers[1]
+                heatmap_view = 1 < current
+            end
+        end
     end
 
     @onchange start_time, time_interval, series_length begin
@@ -204,6 +213,20 @@ const bonito_app = NamedApp(:inherit, Backbone.app)
         model = getmodel(back_session_id)
         model.editmode[] = editmode
         editmode_disable = !editmode
+        if editmode && first_time_in_editmode && heatmap_view
+            first_time_in_editmode = false
+        end
+    end
+
+    @onchange heatmap_view begin
+        if heatmap_view && editmode && first_time_in_editmode
+            first_time_in_editmode = false
+        end
+    end
+
+    @onchange first_time_in_editmode begin
+        @assert !first_time_in_editmode
+        @notify "Toggle the \"edit mode\" off to browse the sequence with the heatmap" :info
     end
 
     @onchange setvalue begin
diff --git a/src/apps/muscles/muscleapp.css b/src/apps/muscles/muscleapp.css
index 436d5d89a569da0f7a841b4d2c84ecc3919ff238..5239c123f715bc275a08e199408dc65b5eedb250 100644
--- a/src/apps/muscles/muscleapp.css
+++ b/src/apps/muscles/muscleapp.css
@@ -12,3 +12,6 @@
   margin-left: 1rem;
 }
 
+.q-notification__message {
+  font-size: 120%;
+}