How to make a bootstrap dropdown extend outside of ion-header / ion-toolbar?

I’m using Angular Bootstrap UI with Ionic 4 and I want to use the bootstrap dropdown component with buttons in the header/toolbar. Problem is the dropdown won’t show outside of the header container E.g. on top of the ion-content below.

I assume this is a super simple css change like overflow: visible or something, but I cannot seem to get it to work.

Any help would be appreciated.

anyone able to suggest something?