How to hide the project's workspace dropdown in the Knowledge base site?

If a user has access to multiple project workspaces, the workspace dropdown appears at the top left of the Knowledge base site. If you want to turn off the workspace selection dropdown option, you can use the below solution.

How can users navigate between the project workspaces without the dropdown?
If you implement the below solution, the user must know the exact URL of the workspace page to access it.

Solution

1. Go to Settings → Knowledge base site → Custom CSS & JavaScript, and Custom CSS tab is the default selection
2. Paste the below CSS snippet in the window

header .header_bottom .header_bottom_nav ul li.versions-selection {
    display: none;
}

3. Click Save

Outcome