Unfortunately you can't covert the whole instance to the legacy/old editor. But you can make the old editor available on your instance. You'd need to reach out Atlassian Support and have them enable back the old editor for you.
According to the PM, Avinoam on this ticket CONFCLOUD-65695 :
In the meantime, if you have the legacy template available - which most of you should have - you can keep using that to create new pages and still keep using this feature. If you don't have that template, you can reach out to support and we'll be happy to enable it for you.
It doesn't seem like it's going away anytime soon. Hope that helps!
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