From the WordPress dashboard click on 6storage -> Settings. 



After selecting the settings you will be landed on the tenant portal setting page.

To customize for your business requirements click on Feature customization you will find Fields, Additional addons & other operations.



By enabling the unit size will display the unit size
 Ex: Width x Length (or) Width x Length x Height

Tenant portal:
In the below image you can see the WxLxH, As an example.


By disabling this option the sizes will not be available.

Tenant portal: