Do this instead:
1) Do Command-F
2) In the "Search for:" blank, type "presc". Wait. A dropdown should pop down suggesting that maybe you mean
Filenames
Name matches: presc
3) Click on where it says "Name matches: presc"
4) The results window should have multiple columns: Name, Size, etc. One of those columns should be "Date Modified". If not, go to the View menu in the standard overhead Finder menu bar and select "Show View Options" and check the checkbox for "Date Modified".
5) Click the column header where it says "Date Modified" to sort by Date Modified. If it shows with an upward-pointing arrow like this: ^ click it a second time to change it to a downward-pointing arrow, which means the most recent Date Modified will be on the top. Any sign of your missing spreadsheet in the found results yet?
If not...
6) Click on and backspace over "presc" where it appears in the "Search for" blank. LEAVE it blank. Below it you should see a place that typically defaults to Kind is Any, and off to the far right of this same windows are a minus sign and a plus sign button. Change "Kind" to "Last opened date". Where it used to say "Any" it should now default to "is within last ___ days". If you know with some degree of precision how recently you had the file open, put that. If you don't, think of a date far enough back in time that you absolutely positive must have had it open since then and put THAT date instead. Now click the "+" (plus sign) button at the far right. The default will probably once again say "Kind is Any. Change "Kind" to "File extension". Type "ods" which is the LibreOffice file extension for spreadsheets.
Anything?