@marcel-sow
You should be able to see the P&L (cash or accrual basis) on the QBO mobile app. This is based on how you've selected setting as the accounting method in QBO.
1. You may also want to verify "Accounting Method" setting again from your computer, using the Chrome browser.
(Gear at the top > Your Company > Account and Settings > Advanced > Accounting > Accounting method > Cash > Save > Done).
2. You may want "refresh data" on QBP mobile app to see that helps.
(Dashboard navigation panel on top three-dotted lines > Help & Feedback > Refresh Data)