How to create a persistent floating window that remains until a button closes it

I've managed to create a window in Blender full of controls, however the only issue is the window closes if I click outside it. I need to to remain on screen until a 'close' button is clicked.

My current code is as follows:

 row.operator("wm.floating_ui", text="Open Test Window", icon='PREFERENCES')

And the class:

class CUSTOM_OT_FloatingPanel(bpy.types.Operator):
"""Floating Window with UI"""
bl_idname = "wm.floating_ui"
bl_label = "Floating Window"
bl_options = {'REGISTER', 'UNDO'}

float_value: bpy.props.FloatProperty(name="Size", default=1.0, min=0.1, max=10.0)
toggle: bpy.props.BoolProperty(name="Enable Feature", default=False)

def execute(self, context):
    self.report({'INFO'}, f"Size: {self.float_value}, Toggle: {self.toggle}")
    return {'FINISHED'}

def draw(self, context):
    layout = self.layout
    layout.label(text="Floating Window", icon='WORLD')
    layout.prop(self, "float_value", slider=True)
    layout.prop(self, "toggle", text="Enable Feature")
    layout.operator("object.select_all", text="Select All", icon='RESTRICT_SELECT_OFF')

def invoke(self, context, event):
    return context.window_manager.invoke_props_dialog(self)

As mentioned this works perfectly, except it closing when clicking outside the window. Any suggestions on how to get the desired behaviour?

Thanks for any help!