I'm on Xcode v16.1 and the steps were different for me. Here's how I did it:

Steps to remove Swift package dependancy

1. In the Project Navigator on the left, select your project
2. Ensure you're on the "General" tab
3. Scroll down to "Frameworks, Libraries, and Embedded Content"
4. Click the dependancy you want to remove, click the minus symbol "-", and confirm the popup

I hope this helps, let me know if you have any questions or trouble with the steps.