diff --git a/app/assets/javascripts/app/controllers/layout_ref.coffee b/app/assets/javascripts/app/controllers/layout_ref.coffee
index bf01f7693..ac2c9397f 100644
--- a/app/assets/javascripts/app/controllers/layout_ref.coffee
+++ b/app/assets/javascripts/app/controllers/layout_ref.coffee
@@ -1521,7 +1521,7 @@ class InputsRef extends App.ControllerContent
       attribute:
         name:        'company-name'
         id:          'company-name-12345'
-        options:     [{value:0,name:'Apple'},{value:1,name:'Microsoft',selected:true},{value:2,name:'Google'},{value:3,name:'Deutsche Bahn'},{value:4,name:'Sparkasse'},{value:5,name:'Deutsche Post'},{value:6,name:'Mitfahrzentrale'},{value:7,name:'Starbucks'},{value:8,name:'Mac Donalds'},{value:9,name:'Flixbus'},{value:10,name:'Betahaus'},{value:11,name:'Bruno Banani'},{value:12,name:'Alpina'},{value:13,name:'Samsung'},{value:14,name:'ChariTea'},{value:15,name:'fritz-kola'},{value:16,name:'Vitamin Water'},{value:17,name:'Znuny'},{value:18,name:'Max & Moritz'}]
+        options:     [{value:0,name:'Apple'},{value:1,name:'Microsoft',selected:true},{value:2,name:'Google'},{value:3,name:'Deutsche Bahn'},{value:4,name:'Sparkasse'},{value:5,name:'Deutsche Post'},{value:6,name:'Mitfahrzentrale'},{value:7,name:'Starbucks'},{value:8,name:'Mac Donalds'},{value:9,name:'Flixbus'},{value:10,name:'Betahaus'},{value:11,name:'Bruno Banani'},{value:12,name:'Alpina'},{value:13,name:'Samsung'},{value:14,name:'ChariTea'},{value:15,name:'fritz-kola'},{value:16,name:'Vitamin Water'},{value:17,name:'Znuny'},{value:18,name:'Max & Moritz'},{value:19,name:'Telefónica Deutschland Holding GmbH'}]
     @$('.columnSelectPlaceholder').replaceWith( columnSelectObject.element() )
 
 App.Config.set( 'layout_ref/inputs', InputsRef, 'Routes' )
diff --git a/app/assets/javascripts/app/lib/app_post/column_select.coffee b/app/assets/javascripts/app/lib/app_post/column_select.coffee
index d7a7fa24c..a6d7e37bb 100644
--- a/app/assets/javascripts/app/lib/app_post/column_select.coffee
+++ b/app/assets/javascripts/app/lib/app_post/column_select.coffee
@@ -68,7 +68,7 @@ class App.ColumnSelect extends Spine.Controller
     @poolOptions.each (i, el) ->
       return if $(el).hasClass('is-hidden')
 
-      if $(el).text().indexOf(filter) > -1
+      if $(el).text().toLowerCase().indexOf(filter.toLowerCase()) > -1
         $(el).removeClass 'is-filtered'
       else
         $(el).addClass 'is-filtered'
diff --git a/app/assets/javascripts/app/views/generic/column_select.jst.eco b/app/assets/javascripts/app/views/generic/column_select.jst.eco
index bb5b27480..5b2a8da44 100644
--- a/app/assets/javascripts/app/views/generic/column_select.jst.eco
+++ b/app/assets/javascripts/app/views/generic/column_select.jst.eco
@@ -12,7 +12,7 @@
   <% end %>
 </select>
 <div class="columnSelect-column columnSelect-column--selected js-selected">
-  <div class="u-placeholder js-placeholder"><%- @T('Nothing selected') %></div>
+  <div class="u-placeholder u-unselectable js-placeholder"><%- @T('Nothing selected') %></div>
   <% for option in @options: %>
   <div class="columnSelect-option is-hidden js-remove js-option" data-value="<%= option.value %>"><%= option.name %></div>
   <% end %>
@@ -29,7 +29,7 @@
   <% end %>
   <div class="columnSelect-pool js-pool">
     <% for option in @options: %>
-    <div class="columnSelect-option js-select js-option" data-value="<%= option.value %>"><%= option.name %></div>
+    <div class="columnSelect-option js-select js-option" data-value="<%= option.value %>" title="<%= option.name %>"><%= option.name %></div>
     <% end %>
   </div>
 </div>
\ No newline at end of file
diff --git a/app/assets/stylesheets/zammad.scss b/app/assets/stylesheets/zammad.scss
index b10a3e635..3b54b8ab7 100644
--- a/app/assets/stylesheets/zammad.scss
+++ b/app/assets/stylesheets/zammad.scss
@@ -123,6 +123,11 @@ blockquote {
   user-select: none;
 }
 
+.u-unselectable {
+  pointer-events: none;
+  user-select: none;
+}
+
 .u-textTruncate {
   white-space: nowrap;
   overflow: hidden;
@@ -7791,12 +7796,9 @@ output {
   }
 }
 
-
 .columnSelect {
+  height: 234px;
   display: flex;
-  height: auto;
-  line-height: 25px;
-  max-height: 300px;
   padding: 0;
   line-height: 22px;
   
@@ -7804,9 +7806,8 @@ output {
     display: none;
   }
 
-  .columnSelect-column--selected {
-    flex-basis: 66%;
-    flex-grow: 1;
+  .columnSelect-column--selected { 
+    flex: 1 1 66%;
     overflow: auto;
     padding: 7px;
   }
@@ -7817,10 +7818,11 @@ output {
     border-left: 1px dotted hsl(0,0%,90%);
     display: flex;
     flex-direction: column;
+    min-width: 0;
   }
 
   .columnSelect-pool {
-    flex: 1;
+    flex: 1 1 auto;
     overflow: auto;
     padding: 7px;
   }
@@ -7830,6 +7832,9 @@ output {
     user-select: none;
     padding: 0 5px;
     border-radius: 1px;
+    overflow: hidden;
+    white-space: nowrap;
+    text-overflow: ellipsis;
     
     &:hover {
       background: hsl(0,0%,96%);