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Hi Jeyaseelan,
Ok - creating a project with 4.8 Framework does show the Syncfusion controls.
I also created a new project target .net 6 and there the control do not show
( <TargetFramework>net6.0-windows</TargetFramework>)
Neither to they show when I create a SyncFusion WinForms app. You can see the items being used on the OutlookForm.cs (on the designer), but the toolbox shows no SyncFusion Controls.
Please note - this happens when you select Use Installed components. If you create another project and you select NuGet packages, then the toolbox works fine.

If the above is expected behavior, then you can close the call.
I must admit, I'm not a fan of NuGet packages.
Regards,
Alex