Separate the prototype link from the design link

When using the prototype link, the design file can be accessed, we cannot close the design link from the prototype, so the prototype must be separated to be a separate link from the design and the main file

With a paid account, you can limit viewing to just the prototype only, and prevent copying on any team project file: https://help.figma.com/hc/en-us/articles/360040045574-Restrict-copying-and-sharing-on-files

This feature is not available on free accounts.