Thanks for your response, Mehtaz Afsana Borsha.
Sorry, but I cannot follow what you mean by "You have used display none on mobile".
Because I even don't know where should a setting like this be inside the template and inside css I never set something like this.
Can you be more precise, please?
How to set css, I know.
But isn't the sense of "presets" to set basic rules, without writing all rules by myself?
P.S.: Those "Available settings:" (https://www.joomshaper.com/documentation/helix-framework/helix-ultimate-2/menu-navigation) are not visible inside the template! (only "Off-canvas Position")