I recently moved from Mint 18.3 (LO 220.127.116.11) to Mint 20 (LO 18.104.22.168).
After the move a Python script that worked fine in 5.1 no longer works
correctly in 6.4. I found that in 5.1 if I did File-->Open a dialog
opens that has a Search option up in the top left corner. In 6.1 the
dialog opened with File-->Open no longer has a Search option.