Hello!
Please go to the Find dialog, click “>” button next to the Find text box, and a menu appears. Please select the “Custom”, then click the “>” button again and select “Save as Default”. This way, next time, it shouldn’t change the initial text that appear in the Find text box.
Likewise, you can do the same way with the File Types drop-down list box, and the Folder drop-down list box — select the “Custom” will remember the last used item.
Thanks!