To clear the settings of a lookup, delete the Lookup field that is being used. Even if you delete a Lookup field, the values of other fields in registered records will not be affected.

To delete a Lookup field, follow the steps below.

1. Click the App settings icon (the gear-shaped icon) at the upper right of the View screen.
   

2. On the App settings screen, click the Form tab.

3. Hover your cursor over the Settings icon (the gear-shaped icon) at the upper right of the Lookup field that you want to delete on the form settings screen, then click Delete.

4. On the Delete field dialog, click Delete.

5. Click Save form at the upper left of the screen.

6. Click Update app at the upper right of the screen.

7. On the Update app dialog, click Update app.