Close DraftSight, Navigate to Home folder, press Ctrl+h to display hidden files, open .config folder and delete all draftsight and dassault folders, open draftsight it will have the toolbars now, from top menu bar go in tools -> options -> system options -> Open / Save as -> Default file types, and set file types to "ASCII/Binary Drawing (.dxf)" and "R12 ASCII Drawing (.dxf)", then on the left panel navigate to User preferences -> Drafting Options -> pointer Control -> EntitySnaps and select snaps according to your preference, recommended selecting all the snaps other than tangent.