Symptoms
Instruction from PBA-E Documentation were used to hide some tabs from PBA-E Control Panel.
But after www container restart the tabs are still visible.
Cause
In PBA-E 5.5 tabs can appear on 2 types of screen: views and lists. View screen is the screen when you check information about object, for example single account(Home>Operations>Customers>[customer]), order, etc. List screen is the screen with list of orders(Home>Operations>Orders), accounts, subscriptions.
PBA-E Documentation provides customization instructions only for view screens and not for list screens. Documentation bug #PBA-56567 was created to fix it.
Resolution
Tabs on list screens are hidden using visibility parameter. So correct customization from documentation will look the following way:
<window id="Plan_MyPlanList">
<elements>
<button id="_ref_PlanAttrPlan_" visibility="no" />
<button id="Changes" visibility="no" />
</elements>
</window>