Why hello @sumitrathi95 Welcome to the community! 
What SuiteCRM version are you using? That meeting invitee bug was resolved in the latest 7.12.2/8.0.1 so I would recommend an update to resolve that.
Kanban Views: We don’t have a kanban view in 7.12.x or 8 currently, but SuiteCRM 8 will have one in the near releases. As for SuiteCRM 7.12.x there are free and paid for plug-ins that provide that. Check out the Show & Tell category particularly Kanban board for any SuiteCRM modules