To replace the current main website for one project, you need to first add it as competitor to the project in question, so that you don't lose the past ranking data.
Simply access the Competitor Settings and add the new domain to be further used for replacement. Then, to switch it as main website, go to Website Settings and using the top drop-down select it from the list.
This way, the competitor will become the main website of the project, keeping the historic rankings gathered so far - in 2 different places.
Tip: The ranking history will not be transferred from the old website to the newly added one when switching the main website.
This way, you can compare the new domain performance, next to the old one.
Do you have any other questions? Don’t hesitate to get in touch and we will keep building the FAQ.