How to change font size of the menu?

Hello Xavier !

To change font size of the menu, you can log in to Dashboard > Appearance > Customize > Header Code, add the following code:

 <style>
.nav-main .navbar-nav > li {
    font-size: 16px;
}
</style>

Hope this helps !

Hi Xavier ! 
Please send me your site for further checking then we will help you change the color of the menu.
– At the moment, Our DW Timeline does not yet support to apply the visual edits from my homepage to other pages.
Hope this helps !

Hi Xavier ! 
To change the menu, you can add the following code to the Header Code: 

<style>
.nav-main a {
 color: #...;
}
.nav-main .navbar-nav > .active > a {
color: #....;
}
.nav-main li a:hover, .nav-main li a:active, .nav-main .active > a {
color: #...;
}
.nav-main .navbar-nav > .active > a {
color: #....;
}
.nav-main .navbar-nav > li {
font-size: 16px;
font-style: italic;
font-weight: bold;
}
.nav-main .navbar-nav ul a:hover {
color: #...;
}
.nav-main .navbar-nav > .active {
 border-bottom-color: #...;
}
.nav > li > a:hover, .nav > li > a:focus {
 background: #...;
}
.nav-main .navbar-nav ul a {
 color: #.....;
}
.nav-main .navbar-nav ul a:hover {
 color: #....;
}
.nav-main .navbar-nav ul li {
 background: #.....;
}
</style>

Hope this helps !