Menu is not displayed in wp admin

Hi,

Do you have WooCommerce plugin activated? You would need that as well.

yes, off course

using query monitor plugin I see an error: wp-auth-check heartbeat (missing)

That error “wp-auth-check heartbeat (missing)” shouldn’t be related to Themify Product Filter plugin.

Could you post some screenshots to show that product filer plugin is activated on your admin, but not showing the “Product Filter” link? You have this on admin sidebar: https://share.getcloudapp.com/04uqEnPd