How to enlarge the font-size and line-height of the standard off-canvas mainmenu (both parent- and child menu-items)

Hi there!

Thanks for contacting us.

Here is the custom code to set parent menu item:

.offcanvas-menu .offcanvas-inner ul.menu>li>a, .offcanvas-menu .offcanvas-inner ul.menu>li>span {
    font-size: 20px;
    line-height: 18px;
}

And here is the custom code to set child menu item:
.offcanvas-menu .offcanvas-inner ul.menu>li>ul li a {
    font-size: 16px;
    line-height: 20px;
}

.offcanvas-menu .offcanvas-inner ul.menu>li>a, .offcanvas-menu .offcanvas-inner ul.menu>li>span {
font-size: 20px;
line-height: 18px;
}

.offcanvas-menu .offcanvas-inner ul.menu>li>ul li a {
font-size: 15px;
line-height: 18px;
}lease put these code in your custom.css file. You can change pixel values as per your need. Hope this helps!

Best Regards