I don’t want meal vouchers to be the pre-selected payment method. I want to choose this manually at every payment.

You have 2 options to deactivate it: 

  1. Go to the Services of the app, tap on Meal vouchers and deactivate the option to “always pay with meal vouchers”. 
  2. Go to the Menu on the top left corner of the app, tap on Payment methods, tap on your meal voucher card and then deactivate the option “Meal vouchers as default”.