You can add this custom CSS code:
.t4-offcanvas .t4-off-canvas-body.menu-item-always-show .navbar .sub-menu-toggle {
display: none;
}
.t4-offcanvas .t4-off-canvas-body.menu-item-always-show .navbar .dropdown-menu {
display: block;
}
to 1 of these 2 files if they exist on your site:
root/templates/ja_stark/local/css/custom.css
root/templates/ja_stark/css/custom.css