Offcanvas burger item and menu icon position

Hello,

I try to adjust the Offcanvas Menu.
After entering System -> Site Template Styles -> <template>- Default -> Template Options -> Menu -> Mega Menu and changed "Menu Type" to "Mega Menu" (which makes the Burgermenu Item disappear), saving it and switching it back to Offcnavas, it looks like this (before switching, it looked allright)
https://prnt.sc/bYJ6FR8yocD9

And the menu item icons are displayed like this
https://prnt.sc/gcTHcl5tHmTv

I tried to fix it with this

.offcanvas-menu {
   /*background-color: #002039;
   background: #002039;*/
   font-size: 24px !important;
   display: inline-block !important;
}

Please help