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@Yong-Wook0
This funktion is quite hidden in the airbnb Software and hard to find.
First You have to go to the spot where You can set Your dashboard language. As You may know You can chose from several languages like english, spanish, german. I chose german as I am in Germany.
The square/circle function is a subcategory in the selection of Your preferred language. So first You chose Your language and then there's a tickbox how You want Your pictures displayed. I my case I could chose from:
German / square
German / circle
Good luck.