I use navbar-toggler, but not all styles are used, why. The answer, if possible more precisely 
1 answer
Connecting the bootsrap styles to laravel in the resources / assets / sass / app.scss file:
// Bootstrap @import "~bootstrap-sass/assets/stylesheets/bootstrap";
If Js and CSS are compiled correctly ( https://laravel.com/docs/5.6/frontend ), then the button navbar-toggler in bootstrap 4 according to your layout should appear with a screen width of less than 768px.
@media (min-width: 768px) .navbar-expand-md .navbar-toggler { display: none; }
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