From where can I enable the Membership for WooCommerce plans to show on the front end?

Admin can enable the Membership for WooCommerce plans from the General settings of Membership for WooCommerce plugin:

Go to Dashboard > WP Swings > Membership for WooCommerce > General Settings.

Admin can enable/disable Membership for WooCommerce plugin functionality on the front end. The users won’t see it if you disable it.