In 14.3 version, we have a custom built portlet which shows data for Request for Estimates object (sub-object of project object). In this portlet,there is a link on Estimate ID which opens up Request for Estimate page on a new window and when user click on Save & Return or Return, it redirects to portlet list layout.
Now we have upgraded to 15.3 and here while clicking on Save & Return or Return redirects back to Project properties page and after again clicking on Return, it redirects to portlet list page.
So, a user has to click the Return button 2 times as opposed to 1 time in 14.3
We just wanted to check if there is design changes implemented in 15.3
Not attempting to answer your question relating to 'design changes implemented in 15.3', but have you considered making the link 'Open as Pop-Up'? This way the user completes 'Request for Estimate' in the 'pop-up', and once completed, can close the 'pop-up' and they will still be on the 'custom built portlet'.
Yes, it is set as open as pop up
Did you check that the linked page (Request for Estimate) is properly selected (mentioned) within the attribute (Estimate ID) after the upgrade?
Yes, link is set up properly
I mean is the link associated with the correct field/attribute?