Hi,
If you don't have any view overrides or CSS customization, the update to the latest version shouldn't change anything.
However, the more you have customization, and the more you can experience display issues that will have to be resolved with some setting changes or additional CSS added to the website.
The best is to first make a copy of the website and test the update on that copy in order to find out the potential problems you'll have so that you can be prepared when you do it on your live website.