Category (classification)

Could diacritics be disregarded in classification (category) look-ups ?

If a classification item is wordy and its length exceeds one line, can it be made into two lines so that everything is visible on tablet?

No, negative. Diacritics may be essential and change the meaning of the word. Characters with diacritics have their own unique unicode character codes and thus are matched as distinct characters.

You can prepare the lookup items without diacritics if you feel they are not essential. See for example, here.