Ok. I found how to do it. I found this site that says:
1) Select the 'Tools' menu and select 'Options...'. (The 'Options' dialog box appears.)
NOTE: If 'Options...' does not appear, click the down-arrow at the bottom of the 'Tools' menu to expand the menu.
2) Click the 'Edit/Find' tab.
3) In the 'Default find/replace behavior' group, do one of the following:
'Default find/replace behavior' group
a) To have Access search the current field and match the whole field by default, select the 'Fast search' radio button.
b) To have Access search all fields and match any part of the field by default, select the 'General search' radio button.
c) To have Access search the current field and match the beginning character or characters of the field by default, select the 'Start of field search' radio button.
4) To apply the new settings and close the 'Options' dialog box, click 'OK'.
Option b is what I want. The thing that bugs me is I already looked at this before but I never selected "General Search" because because I didn't understand what General Search meant.
Oh well, at least it works now.