diff --git a/MP.MONO.UI/Components/ParamOverview.razor b/MP.MONO.UI/Components/ParamOverview.razor
index 2e626ba..a52e9ef 100644
--- a/MP.MONO.UI/Components/ParamOverview.razor
+++ b/MP.MONO.UI/Components/ParamOverview.razor
@@ -9,7 +9,7 @@
     <ul class="list-group">
         @foreach (var item in ListRecords)
         {
-            <li class="list-group-item list-group-item-action" @onclick="() => raiseSelect(item.Title)">
+            <li class="list-group-item list-group-item-action @cssActive(item.Title)" @onclick="() => raiseSelect(item.Title)">
                 <div class="row" title="click to show graph">
                     <div class="col-4">
                         @if (!string.IsNullOrEmpty(item.CssIcon))
diff --git a/MP.MONO.UI/Components/ParamOverview.razor.cs b/MP.MONO.UI/Components/ParamOverview.razor.cs
index cee8bc7..3c4b262 100644
--- a/MP.MONO.UI/Components/ParamOverview.razor.cs
+++ b/MP.MONO.UI/Components/ParamOverview.razor.cs
@@ -15,13 +15,22 @@ namespace MP.MONO.UI.Components
 
         #region Private Methods
 
-       
+        private string SelVal = "";
+
+
 
         [Parameter]
         public EventCallback<string> EC_SelValue { get; set; }
 
         protected List<chartJsData.chartJsTSerie> LevelVal = new List<chartJsData.chartJsTSerie>();
 
+        protected string cssActive(string ParamName)
+        {
+            string answ = ParamName == SelVal ? "bg-dark text-light": "";
+            return answ;
+
+        }
+
 
         private void ParametersPipe_EA_NewMessage(object? sender, EventArgs e)
         {
@@ -53,6 +62,7 @@ namespace MP.MONO.UI.Components
 
         protected async Task ReloadData()
         {
+            SelVal = "";
             ListRecords = await MMDataService.MachineParameters();
         }
 
@@ -67,6 +77,7 @@ namespace MP.MONO.UI.Components
 
         protected void raiseSelect(string SelectedValue)
         {
+            SelVal = SelectedValue;
             EC_SelValue.InvokeAsync(SelectedValue);
         }
 
diff --git a/MP.MONO.UI/Components/ParamPlot.razor b/MP.MONO.UI/Components/ParamPlot.razor
index af2e523..eae6475 100644
--- a/MP.MONO.UI/Components/ParamPlot.razor
+++ b/MP.MONO.UI/Components/ParamPlot.razor
@@ -1,12 +1,39 @@
 @using MP.MONO.UI.Components
 @using MP.MONO.Core.DTO
 @using MP.MONO.UI.Data
+@using Microsoft.Extensions.Configuration;
+
+@inject IConfiguration Configuration;
 
 @inject CurrentDataService MMDataService
 
 <div class="row">
-    <div class="col-12">
+    <div class="col-12" align="center">
         <b>@SelectedParam</b> - <i>@(LevelVal.Count) rec</i>
+        <div align="right">
+            <button class="btn btn-primary" @onclick="() => toggleParam()">
+                @if (showParam)
+                {
+                    <i class="fa-solid fa-chevron-right"></i>
+                }
+                else
+                {
+                    <i class="fa-solid fa-chevron-left"></i>
+                }
+                 @if (showParam)
+            {
+                <div>
+                    <b>Num rec</b> <input @bind="@maxRecord" />  <b>Sample sec time</b> <input @bind="@sampleSecMin" />
+                </div>
+            }
+            </button>
+            @*@if (showParam)
+            {
+                <div>
+                    <b>Num Val</b> <input @bind="@maxRecord" />  <b>Sample sec time</b> <input @bind="@sampleSecMin" />
+                </div>
+            }*@
+        </div>
     </div>
     <div class="col-12">
         @if (LevelVal == null || LevelVal.Count == 0)
@@ -15,7 +42,7 @@
         }
         else
         {
-            <MP.MONO.UI.Components.Chart.Line AspRatio="2" DataTS="@LevelVal" lineColor="@getLineColors("0.75")" backColor="@getFillColors("0.25")" pointColor="@getPointColors("1")" lTens="0"></MP.MONO.UI.Components.Chart.Line>
+            <MP.MONO.UI.Components.Chart.Line AspRatio="4" DataTS="@LevelVal" lineColor="@getLineColors("0.75")" backColor="@getFillColors("0.25")" pointColor="@getPointColors("1")" lTens="0"></MP.MONO.UI.Components.Chart.Line>
         }
     </div>
 </div>
diff --git a/MP.MONO.UI/Components/ParamPlot.razor.cs b/MP.MONO.UI/Components/ParamPlot.razor.cs
index a631cef..7f63724 100644
--- a/MP.MONO.UI/Components/ParamPlot.razor.cs
+++ b/MP.MONO.UI/Components/ParamPlot.razor.cs
@@ -3,6 +3,7 @@ using MP.MONO.Core.DTO;
 using MP.MONO.Data;
 using Newtonsoft.Json;
 
+
 namespace MP.MONO.UI.Components
 {
     public partial class ParamPlot
@@ -12,8 +13,14 @@ namespace MP.MONO.UI.Components
 
         protected DateTime lastRec = DateTime.Now.AddMinutes(-1);
 
-        protected int sampleSecMin = 2;
+        protected int sampleSecMin = 1;
 
+        //protected string cssSel(string ParamName)
+        //{
+        //    string answ = ParamName == SelVal ? "fa-solid fa-chevron-right" : "";
+        //    return answ;
+
+        //}
 
         protected string _selParam { get; set; } = "";
 
@@ -64,7 +71,15 @@ namespace MP.MONO.UI.Components
             await Task.Delay(1);
             MMDataService.parametersPipe.EA_NewMessage += ParametersPipe_EA_NewMessage;
         }
+        private int maxRecord = 10;
 
+        private bool showParam = false;
+        private void toggleParam()
+        {
+            showParam = !showParam;
+        }
+
+        //private int inputValue = 123;
         private void ParametersPipe_EA_NewMessage(object? sender, EventArgs e)
         {
             DateTime adesso = DateTime.Now;
@@ -84,6 +99,10 @@ namespace MP.MONO.UI.Components
                             if (newData != null)
                             {
                                 LevelVal.Add(new chartJsData.chartJsTSerie() { x = adesso, y = newData.ValueNum });
+                                if (LevelVal.Count > maxRecord)
+                                {
+                                    LevelVal.RemoveRange(0, LevelVal.Count - maxRecord);
+                                }
                             }
                         }
                     }
diff --git a/MP.MONO.UI/appsettings.json b/MP.MONO.UI/appsettings.json
index 4180e8d..e40715e 100644
--- a/MP.MONO.UI/appsettings.json
+++ b/MP.MONO.UI/appsettings.json
@@ -18,6 +18,7 @@
     "nKey": "MONO",
     "sKey": "M3T@n0-CH4"
   },
+  "maxRecord": 15,
   "ExternalProviders": {
     "MailKit": {
       "SMTP": {