Change the chart view design because in the horizontal bars i am unable to see name and amount if price different of two people are high. So respective chart of less amount people will display very small. So unable to read name or amount of those people.

A pie chart with clear division on who owes you how much is interesting. Gives an overview.

There should be a chart (pie/bar) in excel sheet or as an another option in app. So, user can check there spends(in amounts and percentage) according to categories not users. Otherwise I have to download the csv then convert this in excel then applied formula and create pie chart. Also, there should be option to add custom categories.