How to Assign Template to Site(s) from Custom Fields menu?

Pre-requisite

Step 1:

Click on the Custom Fields navigation bar item, found on the left beneath the Asset Groups navigation bar item.

Search for the Template that will be assigned to a Site(s).

Step 2:

Click on the Assign Template To Sites button.

Tick to only show Sites which do not have custom fields or leave to show all Sites.

Select the Site or Sites to assign the Template to or click on the Select All button.

Then scroll down and click on the Assign Template to Sites button.