Hello, @TFS,
If you want to open my account page when the user clicks on the signup/login instead of the side tab/popup then simply navigate to the Dashboard >> XSTORE >> Theme Options >> Header Builder >> Account >> from there set the content type to none as you can see in this image: https://postimg.cc/2LrSK2kx by doing this when the user clicks on the “signup/login” it will redirect the user to my account page.
Now, your second, point the thing is the page my account and the content of the account page appear in the side tab is coming from the WooCommerce plugin there is no option in the theme to edit/change it. Changes require extra customization.
Regards 8Themes Team.