Steps:

• First go to your post
• Select Dimensions accordion on settings menu

• Select the checkbox to show the dimensions
• Uncheck the box if you don’t want to show the dimensions

• You can also select the Units as you want

• For Units there are three units options such as (Centimeter, Meter, Inch)
• You can choose either one of them to show on the dimensions
• Then save it to see the end result