Undo the last annotation
Redo the last undo
Switch to the computer interactive mode
Select a white or black background or one of 4 patterns (whiteboard mode only)
Change custom pen or highlighter color and width
Write or draw free-form lines with custom pen
Write or draw free-form lines with transparent highlighter pen
Black pen (fine point on left, thick on right)
Red pen (fine point on left, thick on right)
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