If users want to disable the required 'Side of Segment' field from the one range locator, users can edit the USAddress.lot.xml file. The XML file can be found in the following folder: 'C:\Program Files (x86)\ArcGIS\Desktop10.3\Locators'. The Side of the segment can be set to "false" or the required = "true" portion can be edited out of the XML file. This may require an XML editor like notepad++. The following is an example snippet. Keep in mind, this change requires ArcMap to be closed. It is advisable to make a copy of the USAddress.lot.xml file.
</field_role>
<field_role name="Primary.Side" required="false">
<display_name>Side of the segment</display_name>
<preferred_name>SIDE</preferred_name>
</field_role>
Note: Users can search for "Side of the segment" to find the required line to edit.