How do I merge all layers in Illustrator?

To merge layers in Adobe Illustrator, select the layers you want to merge and then use the "Merge Selected" option in the Layers panel.

Here's a more detailed breakdown:

1. Open the Layers Panel: If the Layers panel isn't visible, go to Window > Layers.
2. Select the Layers: Click on the name of the first layer you want to merge. Then, hold down the Shift key and click on the last layer you want to merge. This will select all the layers in between as well. Alternatively, use Cmd/Ctrl+Click to select non-contiguous layers.
3. Merge Selected Layers: In the Layers panel menu (the three horizontal lines in the top-right corner of the panel), choose "Merge Selected." All selected layers will be combined into a single layer.

Important Considerations:

• Layer Order: The topmost selected layer will retain its name, and the merged content will be placed within this layer.
• Troubleshooting: If you can't merge layers, ensure the objects on each layer are compatible for merging. Raster and vector objects might require different handling.
• Alternative: You can also drag one layer onto another to merge them.

By following these steps, you can effectively merge layers in Adobe Illustrator to streamline your artwork and manage your design elements more efficiently.