SharePoint Online Hub Site Configuration Steps

Step 1: click Gear Icon > Hub Site Settings…

Step 2: upload a Hub logo and specify a navigation name for the Hub.

• Hub Logo: A little logo image on the Hub Global Navigation menu to the top-left of the navigation. Clicking on the Hub Logo from any site collection navigates the user to the main Hub Site  collection, here i have uploaded Sharepoint Logo.
• Hub Site Navigation Name: This is how the name of the Hub will appear beside the Hub logo in the global navigation at top-left corner. So does not really matter what you called your main hub, you can call it something else in the navigation (i.e. Sharepoint Lovers)

its look like below

Done 🙂🙂🙂