METHOD A
Step 1: Hover over the handbook tile for which you need the URL and click on the "share" icon in the top-left corner.
Step 2: A pop-up will then reveal useful handbook URLs. The one you'll need is the first one under "Published version".
Step 3: Go ahead and copy the directly from here.
METHOD B
Step 1: You can also click the three dots in the top-right corner of a handbook tile.
Step 2: From the dropdown list, click on "Settings".
Step 3: Scroll down to the "Handbook URL" section and copy the URL directly from there by clicking on the paperclip icon.