[Edit] How to change collage/ canvas size

To change the collage/canvas size, please follow the steps below:

In Freestyle: 
1. Click the "Layout" icon on the feature bar. 
2. Click on "Size" to change the size of canvas (1:1, 2:3, Full Screen for wallpaper and Instagram Story)

Please refer to the tutorial collages below.
(iOS):


(Android):

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