You can change its font (and some other options) within FCP without going to Motion. The options are in the Title tab in the inspector.
As for your modified title, It looks like you don't need to change the font to get that behavior. I just tried Open in Motion on it and didn't change anything and it has the same crazy animation as yours.
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Editing the DATE/TIME Title Generator with new type face in Motion Weirdness
09 Oct 2019 15:41 #101953