There are two ways to navigate to the configuration of your action buttons on the sheet, where you can delete the action buttons that are obsolete to your database sheet:
1. Under Form Design Mode > On the left side panel > Form Settings > Actions > click "x" next to the action button you don't need > Save design changes.
2. Or under Form Design Mode > click Form Tools > and find Actions under Form Tool settings.
You will see the configuration of your action buttons is on the left side panel > click "x" next to the action button you don't need > Save your design changes.