How to pin a row:

To pin a row, first click on design mode. Next, click the background tab and choose a zone. Then, hover over the zone and click the pencil icon. Finally, check the 'stick' checkbox.

Here is how to pin a row:

Step 1: Click the design tab. 

Step 2: Click Background tab (A). 

Step 3: Choose a zone (B). 

Step 4: Hover over the zone and click the pencil icon (same as editing a widget)

Step 5: Check the checkbox 'stick'(C).