This is now working as expected with the latest beta of Sequoia

So here is all the code Table(artViewModel.filteredArtPieces, selection: $selection, sortOrder: $sortOrder, columnCustomization: $columnCustomization) { TableColumn("Image") { artPiece in if let imageData = artPiece.artImage.first, let image = UIImage(data: imageData!) { Image(uiImage: image) .resizable() .frame(width: 50, height: 50) } else { Image(systemName: "photo") .resizable() .frame(width: 50, height: 50) } } .customizationID("Image") TableColumn("Name", value: \.artName) .customizationID("Name") TableColumn ("Art ID", value: \.artPieceID) { artPiece in Text(String(artPiece.artPieceID)) } .customizationID("Art ID") TableColumn ("Price", value: \.artPrice) { artPiece in Text (formatMoneyDouble(artPiece.artPrice)) } .customizationID("Price") TableColumn ("Date", value: \.artcreateDate) { artPiece in Text (artPiece.artcreateDate, style: .date) } // .resizable() .customizationID("Date") TableColumn("Artist", value: \.artistName) .customizationID("Artist") TableColumn("Meduim", value: \.artMedium) .customizationID("Meduim") TableColumn("Type", value: \.artType) .customizationID("Type") TableColumn("Status", value: \.artStatus) .customizationID("Status") TableColumn("Location", value: \.artLocation) .customizationID("Location") /* I want to create columns for this variable var artDefinedFields: [ArtDefinedFields] = [] which is defined in the datasource . */ } .tableStyle(.inset) struct ArtDefinedFields: Identifiable, Codable, Hashable { var id = UUID() var name: String var value: String var isVisible: Bool }

Ended up using a computed variable as Claude31 suggested. Worked great!