Detail this asset from Unity Store: Original Link
This is a paid asset, but now you can download UGUI Kit: Flat Free.
UGUIKit Flat
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UGUI Kit Flat is a user interface kit with a designing ‘flat’, for all developers who want to save time to design the UI, this kit increase workflow with lots of ready prefabricated just for drag and drop, everything is functional (this is not just design) and fully customizable.
Features:
– Toggle Switcher.
– Progress Bar script.
– Source Included.
– +200 Icons.
– a lot of ready-made prefabricated.
– Easy to use.
– Flat design.
– +60 Drag’n’drop components.
– Example scenes.
– Font with 18 styles.
– More Prefabs coming…