Customising dropdown menu in outliner

Clicking on the arrow at the top right of the outliner page for the dropdown does not show custom columns. Is this a fault or being a newbie am i being a dummy? Any help would be appreciated.

The custom fields have no special label to identify them as custom metadat but are arranged at the bottom of the list. Look at project settings and see what if any custom metadata you have created for your project. I have shown my outline with the custom metadata values in a white box.
I realized the other issue is this. For example my Locations custom metadata field has multiple values to choose from in the list. The list options will not show up in the outliner dropdown only the category of custom metadata. (the actual values when chosen will appear in the outliner under the appropiate column)

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thanks worked a treat.