(1) Instead of using the Nav Menu widget, use the Icon List widget.

(2) Content
     (A) Set Layout to Inline
     (B) Create each menu item separately
          (1) Link > Popup > Action = Open Popup > Select the correct template
          (2) Note: Each Nav item will have its own Elementor Popup template

(1) Create each Popup Template
     (A) Templates > Popups > Add New > Enter the name > Create Template
     (B) Create from scratch, 4 column layout
          (1) Edit Popup Settings
               (a) Width: 100 VW
               (b) Height: Fit To Content
               (c) Horizontal: Center
               (d) Vertical: Top
               (e) Overlay: Hide
               (f) Close Button: Show
               (g) Entrance Animation: Fade In Down
               (h) Exit Animation: Fade Out Up
               (i) Style > Popup > Background-color: transparent
          (2) Edit Section
               (a) Style > Background-color: white
               (b) Advanced > Margin-top: 80px