Remove previous sign-on from PowerApps

Recently I finished a Power Apps project. Previously I used my iPhone to test the App via the Power Apps app. Therefore the old tenant’s sign-on is saved in the App.

I am now switching to new project. I need to sign-on with new tenant’s ID. However there is no way to switch. The Power Apps app keep asking me to sign on to old tenant’s ID.

The only way to switch is to delete the Power App app and reinstall it from App store. It is quite silly but it is Microsoft.