No such thing as a Heartbeat Network

I use Onenote all the time but mostly just for basic stuff like text and pictures and links.

An annoying thing started a few weeks back.

My default font for typing is Calibri 11 plain but when I press enter to type more text on the next line it automatically changes to Calibri 14 Bold!

This only happens when I press the enter key to start a new line.

Please stop me tearing my hair out, there's not much of it left now.

using

Windows 10

Onenote (for Windows 10) Version 16001.11727.20076.0