Nova identifies your bills and recurring payments, but things are never perfect. You can correct your bills in 2 ways:

1. From the Track screen:

Go to the Track screen, select the Bills tab:

Then select the transaction you want to correct. You can edit the amount of remove an expected bill:

Or mark a transaction as a Variable Expense by selecting ****"It is not a Bill"

2. From the transaction details

You can select a transaction to change its type from Bills to Variable, or vice versa: