You have three ways to quickly clear your drawings:
Erase last drawing
Single right mouse-click
Erase all drawings
Click the Clear drawing button, found under the Drawing Settings menu
Erase specific drawing
With any drawing tool select, right-click the drawing's attached circle
To erase all chart drawings on mobile:
1. Shake your device like an Etch A Sketch. Please note this is not supported on all browsers.
2. Rotate your device until it is horizontal (i.e. in landscape mode) and select the
Clear drawing button, found under the Drawing Settings menu.
It's not yet possible to delete individual chart drawings on mobile.