Hi,
You can edit the link for the button that shows in single portfolio item page and links to the yoursite.com/portfolio/ You can change the link for that button from Theme options>Portfolio>Portfolio link*. However, I did not find to change the title of that button from dashboard. You may need to edit the title for that link from the file I have already told you above to edit.
and Your changes in your child theme will remain intact even after the update. That is why we encourage using child theme for modification. Thanks
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