Open Krusader, go to "Tools > Locate...", check that the "Locate" dialog
appears. Type a word. Press "Locate". Close Krusader. Check that in the
~/.config/krusaderrc file: after `Search For=` is seen the previously typed
word.
Open Krusader again. Go to the "Locate" dialog, delete the previously typed word
from the comboBox:
a) using Shift+Del when the popup list is seen;
b) or using the arrow keys and Shift+Del when the popup list is not visible.
Try to delete all the typed commands until the list is empty, press Shift+Del
again. Close Krusader. Monitor the changes in the ~/.config/krusaderrc file.
Perform similar experiments with other words, having more words available in the
comboBox.