Hello friend,
You are right. We need to save the macro-enabled file so the solution can work. Have a great day.

Sincerely,
Mandy

Hello, Ace,
To save the code, you should save the Excel file as Excel Macro-Enabled Workbook format. Please try it.

Hello, Dave,
To only increase the drop down menu, here is a workaround to solve it.

First, after inserting the drop down list in your worksheet, then you should insert an Combo Box (ActiveX Controls),and then apply the following VBA code into the sheet module code:

Dim xRg As Range
Private Sub ComboBox1_Change()
On Error Resume Next
xRg.Value = Me.ComboBox1.Text
End Sub
Private Sub Worksheet_SelectionChange(ByVal Target As Range)
On Error GoTo LblExit
With Me.ComboBox1
.Visible = False
If Target.Validation.Type = xlValidateList Then
Target.Validation.InCellDropdown = False
.ListWidth = 120
.ListFillRange = ""
.ListFillRange = Target.Validation.Formula1
.Left = Target.Left
.Top = Target.Top
.Width = Target.Width
.Height = Target.Height
.Font.Size = 16
.Visible = True
Set xRg = Target
End If
End With
LblExit:
End Sub

After inserting the code, now when you click the drop down list cell, a combo box will be displayed, and font size in the drop down menu is increased as you need. And the inserted combo box will be hidden automatically.

Please try it, hope it can help you!

Hello, ITALO,
1. Insert the drop down you need in your worksheet;
2. Then insert a Combo Box (ActiveX Controls) by clicking Developer > Insert > Combo Box (ActiveX Controls), and then drag the mouse to draw a Combo Box object;
3. And then, right click your current used worksheet, choose View Code, and paste the above code into the module;
4. At last, click Design Mode under the Developer tab to disable it.
5. Now when you click the drop down list cell, a combo box will be displayed, and font size in the drop down menu is increased as you need.
Please try, hope it can help you!