Some of Wild Apricot themes now come with fly-out menu:

You can disable fly-out menu by first copying the following CSS in to Settings > CSS customization:
#idMainContainer #idMainMenu LI.itemNormal DIV.dynamicMenuLevelContainer,
#idMainContainer #idMainMenu LI.itemNormal UL.dynamic,
#idMainContainer #idMainMenu LI.itemNormal:hover UL.dynamic,
#idMainContainer #idMainMenu LI.itemNormal A:hover UL.dynamic,
#idMainContainer #idMainMenu LI.itemNormal TABLE.dynamic,
#idMainContainer #idMainMenu TD.itemNormal DIV.dynamicMenuLevelContainer,
#idMainContainer #idMainMenu TD.itemNormal UL.dynamic,
#idMainContainer #idMainMenu TD.itemNormal:hover UL.dynamic,
#idMainContainer #idMainMenu TD.itemNormal A:hover UL.dynamic,
#idMainContainer #idMainMenu TD.itemNormal TABLE.dynamic,
#idMainContainer #idMainMenu SPAN.itemNormal DIV.dynamicMenuLevelContainer,
#idMainContainer #idMainMenu SPAN.itemNormal UL.dynamic,
#idMainContainer #idMainMenu SPAN.itemNormal:hover UL.dynamic,
#idMainContainer #idMainMenu SPAN.itemNormal A:hover UL.dynamic,
#idMainContainer #idMainMenu SPAN.itemNormal TABLE.dynamic
{
display: none;
}
#idMainContainer #idMainMenu LI.itemNormal
{
margin-bottom: 0;
}
next, copy the following JavaScript into Settings > Global javascript:
<script type="text/javascript"> BonaPage.Utils.dynamicMenuDisable(); </script>
Your menu will no longer display child pages when you place mouse over it:

Poetic Apricot (Matthieu)
http://twitter.com/PoeticApricot
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Customization help isn't a service we provide; I will do my best to help you in the forums as time permits however I recommend consulting our partners