You can review your prediction market returns on the Kalshi website by opening "Documents". This page shows yearly PnL and totals across years, with and without fees. On a phone, you can open this link in a browser and sign in.
For a year's report, you can select the download icon in the "Transactions" column next to that year. The download is a ZIP file containing a CSV that you can open in a spreadsheet.
For individual orders, trades, settlements, deposits, withdrawals, and credits, you can open "Your activity". You can select an activity category, then the download icon beside "Your activity" and a date range to export a CSV.
PnL includes returns from closed portions of positions and applied credits or rebates. "PnL with fees" subtracts opening and closing trading fees; "PnL without fees" excludes those fees. The totals exclude deposits, withdrawals, and changes in the value of open positions.