The gallery in PowerApps is a customizable tool used to share important information from a SharePoint list. This can include emails and names of new leads, or information about your largest and most loyal clients.

Create a list In SharePoint

we need to Create a sharepoint list and some Columns.

i Have created a “Bookmark” column.

Type->Choices like below screenshoot

Create a Bookmark Icon within a Gallery:

Click ->Insert

i have add the form with sharepoint list  to my screen 

After that the Bookmark icon will come in gallery

I have Written this formula in Bookmark

“Onselect”–>If(ThisItem.Bookmark.Value=”No”,Patch(‘Sales List’,ThisItem,{Bookmark:{Value:”Yes”}}),Patch(‘Sales List’,ThisItem,{Bookmark:{Value:”No”}}))

“Icon”—>If(ThisItem.Bookmark.Value=”Yes”,Icon.BookmarkFilled,Icon.Bookmark)

When we Save the Bookmark as “Yes” it will filled Check in below Screenshots.

When we Save the Bookmark as “No” it will filled Check in below Screenshots.

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