I am trying to run a P&L report on Quickbooks online by week, but I need the week to start on Mondays. Is that possible?

Hello and welcome to the Community, nathalia-lisarb-

The This Week reporting period on the Profit and Loss report is defaulted to run from Sunday - Saturday and cannot be changed.

As a workaround, you can use the Custom option on the report period drop-down to enter your chosen start and end date. 

If you would like to leave feedback for further reporting options, please see our QuickBooks Idea Exchange forum. We'll be reviewing all ideas submitted here, and if it gets to over 50 votes, we will review it with our Product team. 

Thanks for contacting Intuit QuickBooks support on the Community. We'll be around if you have any further queries!