The FOLDER container is made up of one or more PAGE containers. The default size of a FOLDER container is the size of the largest child PAGE container.
This is why an individual folder page may look like it contains lots of whitespace. If one of the pages takes up the whole screen, then all the other pages in that folder will also take up the whole screen, even though they may only themselves have a small number of items.
This size property also means that in order to determine the size of a folder container, it is necessary to calculate the size of EVERY page container of that folder.
If a folder container contains a large number of pages this is something that needs to be taken into consideration when moving from Native to Universal Rendering as this calculation maybe slower.
Read more at
https://4js.com/ask-reuben/ig-108/
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