Question about a network layout (simple one)

Quick question, I was trying to rethink our network layout (https://imgur.com/a/tATxUJB)

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We always kept that mini switch inbetween our Meraki and internet (at the very end, our ISP provides a router which convert fiber to RJ45, the RJ45 is plugged to the Cisco SG 200-08).

I'm new at my company and the previous guy mentioned it was designed this way for a DMZ to keep the FTP server secure.

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Connected to that switch and I don't see any DMZ configuration.

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Would it be still secure for that FTP server to be plugged to our Meraki MX100 ? So we could get ride of that mini switch.

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Thanks,