This is a core PowerSchool function and here are the instruction from PowerScource:
When signed in to the PowerSchool Student and Parent portal, students and their parents can use the Balance icon to access fee transaction and lunch balance information. For PowerSchool users who do not use PowerLunch or the Fees component, the option is available to remove the Balance icon from the PowerSchool Student and Parent portal.
How to Hide/Show the Balance Icon 1. On the start page, choose District under Setup in the main menu. The District Setup page appears. 2. Under District Information, click Miscellaneous. The Miscellaneous page appears. 3. Select the Do not show the lunch balance on parent/student pages checkbox to disable the Balance icon in the PowerSchool Student and Parent portal. When selected, the PowerSchool Student and Parent portal navigation bar no longer displays the Balance icon.
Note: Alternately, deselect the Do not show the lunch balance on parent/student pages checkbox to enable the Balance icon in the PowerSchool Student and Parent portal navigation bar. When selected, the PowerSchool Student and Parent portal navigation bar displays the Balance icon.
You will also need to go to: Start Page>School Setup>Parent/Student Access and click on Avaiable Features and make sure the Fee Transactions are not disabled.