An alternative for the category is to create a Filter:
Select a single cell in the category column, then choose 'Sort & Filter' > 'Filter'. A drop-down button will appear in the cell at the top of the category column. Click this and, in the list of categories, put ticks next to ones required. Click 'OK' and only the rows containing those categories will be displayed.
andy-hughes, the Find results should appear in the Find and Replace window (I'm using Excel Starter 2010, but I would expect things to be similar in later versions):
https://ibb.co/bXCQ8RX
Maybe in your case the window needs to be enlarged? Click on the bottom edge and drag it down.
You may find my second method more useful though, depending on what you are trying to do, because it hides the rows that don't contain the specified category making it easy to see the ones that do.