By default, the UI opens the Inventory window. I suspect that's what you're really seeing. You can't turn it off, but you could close it when you open the bank window. Try adding
OnShow="toggleinventory" or
OnShow="hide_window Inventory.Inventory" to the root <Page> property of eq2ui_inventory_bank.xml (in your mods directory). However, this will
always close your inventory window when you open the bank, even if you want it open.
So the first bit of the file becomes:
Code:
<?xml version="1.0" encoding="utf-8"?>
<Page Activated="true" eq2opensound="ui_window_inventory_open" eq2usescomwndcontrols="true" Location="154,221" MaximumSize="1024,1024" Name="Bank" PackLocation="center,center" PackLocationProp="-358/0001,-163/0001" ScrollExtent="173,232" Size="173,232" UserMovable="true" OnShow="hide_window Inventory.Inventory">