Maybe it's possible to enable a "full document search" option?
When you hit Ctrl-F to search for text, it only searches the current Sheet. In MS Excel you could also search the whole document.
I understand not many users would befenit from this, but if it's a quick fix it would be very handy.
I will check if the third party we use support it.
We checked and unfortunately, the control we use from the third party doesn't support any other options for the search.