Go to file menu and click page set up
 

• set dimensions of poster (cms or inches) in to value boxes for width and heightj

• determine at his stage whether the poster is portrait or landscaped

• unless specified, use standard sizes (most conferences will set a maximum size but to help with printing, the following size are recommended):a

A0 = 118cm X 84 cm (most common size used)
A1 =   84cm X 59cm
A2 =   59cm X 42cm
A3 =   42cm X 29.5cm
p