By default, Unity stores the Brush Picks data asset in the GridBrush
folder located in the Library
of your project. You can store this data directly in your project instead, which helps to keep it in source control and consistent with all users of your project.
To change the Brush Picks asset used by the project, go to Edit > Preferences… > 2D > Tile Palette, and select and edit the Brush Picks asset settings in the Brush Picks section of Tile Palette Preferences.
Library\Gridbrush
folder.
Important: Unity saves Brush Picks to the same location as the current active Brush Picks asset, or the Library
folder if no active Brush Picks asset is set. This means that the names of the Brush Picks must not have the same name as another asset in the same location to prevent conflicts.