To add an outline effect to a layer in the Pixlr Halloween project, which tab should you go to?

To add an outline effect to a layer in the Pixlr Halloween project, the correct tab to access is the Filter tab. This tab contains various options for applying effects and transformations to layers, including outline effects that enhance the visual presentation of elements in your project. Utilizing the Filter tab allows you to explore a range of artistic and aesthetic enhancements that can significantly modify the appearance of layers.

While the other tabs, such as Edit, Layers, and Image, provide various functionalities related to editing your project, adjusting individual layers, and manipulating image properties, they do not specifically focus on effects like outlining. Therefore, the Filter tab is essential for applying such stylistic effects to layers effectively.