In gantt view you can drag and shedule your works to avoid overlapping. you can add new records also directly from gantt view.
AlmightyCS Gantt view on Project & Tasks
Just install this module to add gantt view on AlmightyCS project and tasks views. Not any extra configurations required.
For customization & help ContactUS or get this module From AlmightyCS App Store.
Project Gantt Chart View in odoo
Generic Gantt Chart View Feature