I realised that if someone sends an invitation from a group to someone to join, the mail is sent from notifications@groups.wix.com. It’s really frustrating after everything, I found out this after a couple of days.
I tried searching for these settings to change and non worked. I added my mail address and integrated my Gmail with Wix. But still, other emails sent are from my mail address when it comes to the group invitation its not the right mail address.
I need help to change this as soon as possible.
Your question is not a code related one as it can’t be changed by code, it is a default email address that Wix can only change themselves when, or if, they decide to release an option to do this.
You would be best suited going through Wix Support about this, however certain Wix apps you can’t change the automatic email address.
https://support.wix.com/en/about-wix/contacting-wix-customer-care
This is sooooo bad 
Wix we’re already paying for your service- let us get rid of your branding in the emails
Hi David,
Please submit this request to Wix Customer Care . They collect and share user feedback with product teams. Thanks!