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Dynamics 365 Community / Blogs / Khushbu Rajvi's Dynamic 365 Blogs / Dynamics 365 Business Centr...

Dynamics 365 Business Central: Control FastTab Display using Importance Property

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Khushbu Rajvi. Profile Picture Khushbu Rajvi. 21,578 Super User 2026 Season 1

Have you ever noticed that some fields are displayed directly on the right side when a FastTab is collapsed, such as the Name field in the General FastTab on the Customer Card?


You might have noticed options like:
👉 Show more
👉 Show less
Some fields displayed after clicking Show more. 



This is not random behavior — it is controlled by a powerful UI property in Business Central called the Importance Property.
In this blog, we will understand:
  • How FastTab summary works
  • How to control visible fields
  • How the Show more option behaves
  • And how to use Importance property effectively

The Importance property defines how fields are displayed in a FastTab.

1. Promoted
  • Visible on the page
  • Also shown in the collapsed FastTab header (summary)
2. Standard
  • Visible when FastTab is expanded
  • Not shown in collapsed summary
3. Additional
  • Hidden by default
  • Visible only when user clicks Show more

AL Example – Custom FastTab

pageextension 50100 CustomerCardExt extends "Customer Card"
{
    layout
    {
        addlast(Content)
        {
            group("My Custom FastTab")
            {
                Caption = 'My Custom FastTab';

                field("My Field 1"; Rec."Name")
                {
                    ApplicationArea = All;
                    Importance = Promoted;
                }

                field("My Field 2"; Rec."Phone No.")
                {
                    ApplicationArea = All;
                    Importance = Promoted;
                }

                field("My Field 3"; Rec."E-Mail")
                {
                    ApplicationArea = All;
                    Importance = Standard;
                }

                field("My Field 4"; Rec."Address")
                {
                    ApplicationArea = All;
                    Importance = Additional;
                }

                field("My Field 5"; Rec."Country/Region Code")
                {
                    ApplicationArea = All;
                    Importance = Additional;
                }
            }
        }
    }
}

Result Behavior

When FastTab is Collapsed
  • Promoted fields → shown in header summary
  • Standard & Additional → not visible

When FastTab is Expanded
  • Promoted + Standard fields → visible by default
  • Additional fields → hidden initially

Show More Option
  • When user clicks Show more:
    • Additional fields become visible
  • Helps keep UI clean while still allowing access to extra data

Thanks For Reading…!!

Regards,
Khushbu Rajvi

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