During the last sprint it should be all about making your product as exciting as possible. Making sure it looks the best it can with all the bells and whistles. Add final touches, optimise performance, and create a smooth, professional experience. Focus on engagement, consistency, and user satisfaction.
You will need to show evidence of your process. You can do this a variety of ways:
A overview each week
After completing a task in your project management
Key moments
Use bullet points, screen captures, gifs, images, written info to show this evidence.
*** We do not need every single detail - just key points and a quick summary. ***
Get into Trello (or whatever planning tool you are using) and break this sprint down to easy manageable tasks. You should have some sort of functional outcome that looks pretty reasonable so this focus is on making it awesome.
At the end of 4 weeks you should have something that can be trialled with end users and is pretty much ready to be launched. This is the final trial and feedback session and hopefully there will be only minor tweaks if nothing.
Below are some examples to help you get started.