Learn how to remove drop shadow from art and text layer in Adobe Illustrator CS5 by following this simple tutorial.
Steps

Step 1. Open the file containing the shadow on the graphics and text layers
Collapse the layer to see the layers that exist in it. Execute this command also by clicking on the small triangle in the layers panel.

Step 2. The next step is to select the first text layer
Select the text layer and click on the Appearance panel.

Step 3. With the text layer selected and clicking on the Appearance panel, you will see the appearance attributes of this layer, such as
fill, stroke, set transparency or an effect. In this case - a shadow (drop shadow), then select the shadow layer and drag it to the trash can icon.

Step 4. Now let's move on to the picture that has a shadow
Select it or a layer that has a shadow. In the above picture and example, only the red circle has a shadow, not a cupcake image. Select the red circle and click again on the Appearance panel.

Step 5. Select the shadow layer on it and drag it to the trash can icon
