Indented field on worksheet maybe disables "Find" function?

Hi,

I have a customized lookup page (Page Type = worksheet) that displays records in an "Indented" format using the "IndentationColumnName" and "IndentationControls" properties on one of the columns. The screenshot below shows the design:


The top-level container sets some simple filters on the records being displayed.

When the page is displayed, all search functions - on all columns - are disabled. Ctrl-F doesn't work, and the search action icon on the ribbon is disabled. There is a single key (the primary key) on the table, but as far as I can tell otherwise, the table (and page) are nothing unusual.



Is there some property on a worksheet page that makes it non-searchable? The page was developed in 2013 but we're now using 2013R2.