Check out these two examples - one with app layout and the other with just a navbar, both with fixed pageWidth settings.
<xp:view xmlns:xp="http://www.ibm.com/xsp/core"
xmlns:xe="http://www.ibm.com/xsp/coreex">
<xe:applicationLayout id="applicationLayout1">text
<xe:this.configuration>
<xe:bootstrapResponsiveConfiguration pageWidth="fixed"></xe:bootstrapResponsiveConfiguration>
</xe:this.configuration>
</xe:applicationLayout></xp:view>
<xp:view xmlns:xp="http://www.ibm.com/xsp/core"
xmlns:xe="http://www.ibm.com/xsp/coreex">
<xe:navbar id="navbar1" pageWidth="fixed"></xe:navbar>
<xp:br></xp:br>text
</xp:view>
Is there a way to retrieve and adjust the pageWidth size/margins?