When you turn a field into a lookup field, such as a drop down in Forms, it will replace whatever values are in the static value list.

However even if you require this field, it does not stop someone from using a machine or some other method to select the values in the static list quickly before the lookup is finished.

How can we require the selection of one of the values from the lookup so that a submitter is not able to bypass the lookup and submit.

For example they are choosing choice 1 here which is only a value of the static list, not one of the lookup values. They must be filling this field out with lightning speed (maybe using automated technology) since this is far from the first field presented on the form.

To prevent this we want to require that a lookup value is chosen for these fields, not the static list, the static list should be disabled entirely.