: How can I hide parts of an object that don't overlap another object? What is the best way to remove the part of the blue object that doesn't overlap the grey object?

@Megan533

The easiest way is to use a clipping mask.


Select your grey object.
Copy it (Ctrl / Cmd+c or Edit > Copy).
Paste it in front (Edit > Paste in Front or Ctrl / Cmd+f).
Arrange the copy so it is on top of the blue object. Use the layers palette or the arrange shortcuts Ctrl / Cmd+[ and Ctrl / Cmd+] for this.
Remove all appearance from the grey object: stroke, fill and effects.
Select both the no-stroke-no-fill object and the blue object.
Make a clipping mask: Object > Clipping Mask > Make.


The mask is a 'clipping group' you can edit to change either the clipping path or the masked object. You can enter the group in the Layers palette or with double click to enter isolation mode.

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