These options allow you to apply color or style to the objects. Note that you can also select color and style of the object before drawing new object: simply deselect previous object (if any), change style selections and draw new object.
Thick
Changes drawn object formatting to thick style.
Dotted
Changes study formatting to dotted style.
Left Extend
Extends the trendline to the left.
Right Extend
Extends the trendline to the right.
Snap to price
Turns on the magnet that snaps the drawn studies to the prices. Snap to price % threshold can be set in Preferences window. Snap to price % threshold defines how far price 'magnet' works, it will snap to price when the mouse is nearer than % threshold from H/L/C price