Need some Presales help for themes

We are finalising themes from below

  1. Qwery - Multi-Purpose Business WordPress Theme + RTL by AncoraThemes
  2. KALLYAS - Creative eCommerce Multi-Purpose WordPress Theme by hogash

We have some presales questions about these as following

  1. Can we build pages in Elementor?
  2. Can we customize Layouts?
  3. Can we write our own JS files for menus?
  4. Dropdown content size can be changed?

Please do let us know

Contact the theme authors for the information you need. They should provide the correct information