When a person is not (was not) a registered voter (no id in the REG ID field).

From the edit menu - "Set MN Registerd voter ID"

Then from file menu - "Refresh Using Minnesota Registered Voter List"

Step by Step below.

Step 1. see if we can find the others that are not registered, in the reg voter list.  - Search for people in MN with blank (/b) Reg ID

Step 2. Set their ID, from edit menu - "Set MN Registerd voter ID"

Step 3. Search for people with MN and reg ID's

Step 4. run from the file menu "Refresh Using Minnesota Registered Voter List"