Multi Picklist separates selected options by a semi-colon (;) which itself imposes OR condition in Salesforce.
For example; we have Multi Picklist field name Field 1 and criteria specified as below:
For criteria (1 OR 2). It processes records which match to criteria below and change record owner.
(Field 1 equals Option 1 OR Field 1 equals Option 2) OR (Field 1 equals Option 1 OR Field 1 equals Option 2)
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For criteria (1 AND 2). It processes records which match to criteria below and changed record owner.
(Field 1 equals Option 1 OR Field 1 equals Option 2) AND (Field 1 equals Option 1 OR Field 1 equals Option 2)
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