You can enable this option by following these steps:
1. Find key "AllowCloseVerb" in web.config and change value to "true"
<
add
key
=
"AllowCloseVerb"
value
=
"true"
/>
2. Find this file "..\MonoX\MasterPages\MonoX.master" in your project
3. Go to this line:
<
portal:HiddenCatalogPart
ID
=
"hiddenCatalogPart"
runat
=
"server"
Title="<% $Code: DefaultResources.MonoXMaster_HiddenCatalogPart_Title %>" />
4. Paste below code after above line:
<
asp:PageCatalogPart
ID
=
"pageCatalogPart"
runat
=
"server"
Title="<% $Code: DefaultResources.MonoXMaster_PageCatalogPart_Title %>" />
5. Save the file and refresh the MonoX in browser.
6. Login as administrator and click to "Change the look and functionality of this page" => "Part catalog" and you will see new web part catalog "Closed parts catalog (1)" with closed web parts. (Please check the attached screen shots.)
Please let me know is this was helpful for you.