Dear Sjoerd,
Please try it once again. The typography option for Heading Font option and menu works fine.
If it still doesn’t work then send us the username & password of your admin panel at [email protected]
For your third query, please send add the given CSS code in Additional CSS
Appearance->Customize->Additional CSS
.header-transparent .main-navigation ul ul {
background: rgba(0,0,0,.35);
border: medium none;
}
.header-transparent .main-navigation ul li ul li a {
color: #fff;
}
.header-transparent .at-sticky .main-navigation ul ul {
background: #414852;
}Best Regards!