/* Hides the redundant 'Functions' or 'Defines' titles from Breathe */
.breathe-sectiondef-title {
    display: none !important;
}

/* Target only Macros, not Functions */
.macro .sig-name.descname + .sig-paren, 
.macro .sig-name.descname + span,
.macro .sig-name.descname + em {
    margin-left: 15px !important;
    display: inline-block;
}

/* If you are using the C++ domain specifically, you can be even more precise: */
.cpp.macro .sig-name.descname + .sig-paren,
.cpp.macro .sig-name.descname + span {
    margin-left: 15px !important;
}