I also tried to use the TNextGrid6 and edit the columns but I'm getting this:
https://imgur.com/a/eQ3joNW
[1ABB6ABF]{NxGrid6Run_cb10_3.bpl} NxCustomGrid6.pas.TNxCustomGrid6.SetSelectionColor (Line 3825, "NxCustomGrid6.pas" + 1) + $3
[04E051BC]{NxGrid6Dsgn_cb10_3.bpl} NxColumnsEditor6.pas.TNxColumnsEditor6.Create (Line 229, "NxColumnsEditor6.pas" + 12) + $E
[04E0A79F]{NxGrid6Dsgn_cb10_3.bpl} NxGridReg6.pas.TNxColumnsProperty6.OpenEditor (Line 471, "NxGridReg6.pas") + $12
[04E0A68A]{NxGrid6Dsgn_cb10_3.bpl} NxGridReg6.pas.TNxColumnsProperty6.Edit (Line 445, "NxGridReg6.pas" + 2) + $3
[04E09BA9]{NxGrid6Dsgn_cb10_3.bpl} NxGridReg6.pas.TNxGridComponentEditor6.EditProperty (Line 245, "NxGridReg6.pas" + 7) + $5
[21032B40]{designide260.bpl} DesignEditors.TDefaultEditor.CheckEdit (Line 2739, "DesignEditors.pas" + 2) + $5
[21032914]{designide260.bpl} DesignEditors.GetComponentProperties (Line 2654, "DesignEditors.pas" + 95) + $23
[21032DEC]{designide260.bpl} DesignEditors.TDefaultEditor.Edit (Line 2785, "DesignEditors.pas" + 7) + $24
[04E09B46]{NxGrid6Dsgn_cb10_3.bpl} NxGridReg6.pas.TNxGridComponentEditor6.Edit (Line 233, "NxGridReg6.pas" + 1) + $3
[04E09C81]{NxGrid6Dsgn_cb10_3.bpl} NxGridReg6.pas.TNxGridComponentEditor6.ExecuteVerb (Line 261, "NxGridReg6.pas") + $5
[5284F012]{vcldesigner260.bpl} VCLSurface.TVclDesignSurface.ComponentVerb (Line 2918, "VCLSurface.pas" + 3) + $B
[50E520F2]{vcl260.bpl } Vcl.Menus.TMenuItem.Click (Line 2563, "Vcl.Menus.pas" + 19) + $8
[50E5381F]{vcl260.bpl } Vcl.Menus.TMenu.DispatchCommand (Line 3507, "Vcl.Menus.pas" + 5) + $2
[50E54AAA]{vcl260.bpl } Vcl.Menus.TPopupList.WndProc (Line 4680, "Vcl.Menus.pas" + 4) + $E
[5006030C]{rtl260.bpl } System.TMonitor.CheckOwningThread (Line 19122, "System.pas" + 2) + $0
[5006062E]{rtl260.bpl } System.TMonitor.Exit (Line 19312, "System.pas" + 1) + $2
[5006068A]{rtl260.bpl } System.TMonitor.Exit (Line 19334, "System.pas" + 2) + $7
[50CF65D7]{vcl260.bpl } Vcl.Graphics.FreeMemoryContexts (Line 7138, "Vcl.Graphics.pas" + 12) + $8
[50D19314]{vcl260.bpl } Vcl.Controls.TWinControl.MainWndProc (Line 9977, "Vcl.Controls.pas" + 3) + $6
[50E549F9]{vcl260.bpl } Vcl.Menus.TPopupList.MainWndProc (Line 4655, "Vcl.Menus.pas" + 2) + $5
[50179C9C]{rtl260.bpl } System.Classes.StdWndProc (Line 17959, "System.Classes.pas" + 11) + $2
[50E6ECCF]{vcl260.bpl } Vcl.Forms.TApplication.ProcessMessage (Line 10747, "Vcl.Forms.pas" + 23) + $1
[50E6ED12]{vcl260.bpl } Vcl.Forms.TApplication.HandleMessage (Line 10777, "Vcl.Forms.pas" + 1) + $4
[50E6F045]{vcl260.bpl } Vcl.Forms.TApplication.Run (Line 10915, "Vcl.Forms.pas" + 26) + $3
[0051D06E]{bds.exe } bds.bds (Line 214, "" + 7) + $7