When your base is first loaded the amount of fields from your Airtable view will be set based on the template you choose. If you want to toggle fields on or off in either the main view or the modal this can be done so by using the toggle found within the the 'Fields' panel in the editor:

When you open the 'Fields' editor this will display all the relevant settings. Click between 'Card' and 'Modal' to then define which fields you want to display by using the toggle.

Based on the template you choose you will also have the option to show or hide fields in either the card body, or the card header. Clicking on 'Manage fields in the card header' opens a new panel where you can define which fields show here:

Want to see how you can customize the look and feel of your base? Check out this guide for more info.