How do I customize the Save As tab in the MS Access Backstage?

I need to address two related issues in the following Custom UI for Access 2016:

<customUI xmlns="http://schemas.microsoft.com/office/2009/07/customui">
    <ribbon startFromScratch="true"/>
    <backstage>

        <!-- Hide Home tab. -->
        <tab idMso="PlaceTabHome" visible="false"/>

        <!-- Hide New tab. -->
        <tab idMso="TabOfficeStart" visible="false"/>

        <!-- Hide Open tab. -->
        <tab idMso="TabRecent" visible="false"/>

        <!-- Hide Info tab. -->
        <tab idMso="TabInfo" visible="false"/>

        <!-- Hide Save Database As task on Save As tab. -->
        <tab idMso="TabSave">
            <firstColumn>
                <taskFormGroup idMso="SaveGroup">
                    <category idMso="FileTypes">
                        <task idMso="SaveDatabaseAs" visible="false"/>
                    </category>
                </taskFormGroup>
            </firstColumn>
        </tab>

        <!-- Hide all but Print Preview task on Print tab. -->
        <tab idMso="TabPrint">
            <firstColumn>
                <taskGroup idMso="GroupPrint">
                    <category idMso="PrintCategory">

                        <!-- Hide Quick Print task on Print tab. -->
                        <task idMso="FilePrintQuick" visible="false"/>

                        <!-- Hide Print Dialog task on Print tab. -->
                        <task idMso="PrintDialogAccess" visible="false"/>
                    </category>
                </taskGroup>
            </firstColumn>
        </tab>

        <!-- Hide Close button. -->
        <button idMso="FileCloseDatabase" visible="false"/>

        <!-- Hide Account tab. -->
        <tab idMso="TabHelp" visible="false"/>

        <!-- Hide Feedback tab. -->
        <tab idMso="TabOfficeFeedback" visible="false"/>

        <!-- Hide Privacy Options button. -->
        <button idMso="ApplicationOptionsDialog" visible="false"/>
    </backstage>
</customUI>

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When the database opens, the Backstage (i.e. File tab) displays this:

(Screen Shot A)

If I open an object (say, a Query Definition), then it displays this:

(Screen Shot B)

If I then close the database object, the Backstage does not revert to Screen Shot A, as I would expect.

Additionally, if the user clicks the "Save As" button -- with no database object open -- then the following error displays:



Issue #1: How do I hide the "Advanced" option ("Save As Client Object"), which is grayed-out and unavailable, but still visible, in Screen Shot B?

Issue #2: How do I get the Backstage to revert from Screen Shot B to Screen Shot A without closing/reopening the database, or otherwise avoid the above error, when no database object is open?

(I assume that my Custom UI is either incomplete or conceptually flawed.)