You can drag the projects in your project list to control how they show on the website.

Homepage order is initially controlled from the main projects list; however if you have a homepage portfolio setup to control the selection of projects on the homepage then you will need to change the order of the projects inside that portfolio.

You can check if you are using a portfolio for your homepage in Settings > Advanced > Homepage Portfolio.

Examples:

Show all means it will use the main projects list as the feed and thats where you will control the order.

Portfolio name means its using that portfolio so you will control the order oof projects inside that portfolios