Here are the steps you need to follow to merge a card:

Step 1. Drag your card upon the card you want to merge with

Final Step. Once you do that, you’re going to see a message saying: “Are you sure you want to merge the cards?”

Now click on the “Yes, merge it!” button to merge your cards.

Here are the steps you need to follow to unmerge a card:

Step 1. Find the card you want to unmerge and click on the 3 dots icon (ellipsis)

Step 2. Now select the "Unmerge card" option

Final Step. After selecting the "Unmerge card option", you’re going to see a message saying: “Are you sure you want to unmerge this card?”

Now click on the “Yes, unmerge it!” button to unmerge your cards.