It can be either, depending on context: Focus on it to a greater extent. or Focus a larger amount (of something mentioned in the context) on it. The former seems more common.
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Hans51Thank you so much as usual but is there a meaning difference between the former to a greater extent and the latter a larger amount?"to a greater extent" is adverbial, so in the first case "focus" is intransitive. When "focus" is intransitive, the implied meaning is usually "focus one's mind/attention/effort" or else is something to do with optics. "a la