I can do a simple browser search (CTRL F) for a keyword of my choice on any screen up until I get into a Portfolio or Watchlist, then the CTRL F function is not available, UNLESS I don't close my search.
If I don't, the search window remains open and I can change the keyword, but if I close it, CTRL F does not work any longer.
In a long list it would be a quick and simple way to find something one is looking for.