Don't know Likebook at all.
On my Onyx devices I got to: Settings / More Settings / System Display and then choose the appropriate font size.
On my Hisense A5 phone, I go to: Settings / Display and brightness / and scroll down to System to choose the appropriate font size.
If you can install apps on the Likebook, you might want to try a Hidden Settings app. There are a few of them out there and they can make navigating to the correct area in Settings a little easier than trying to discover it in the native Settings area on a device.
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