Side tabs unreadable

At the risk of appearing stupid, does anyone else know why the side tabs on my installation of Dorico appear oversized and unreadable? This only occurs in the ‘WRITE’ mode and was fine on my Surface Pro 3. I have attached a screenshot to show what I mean and any help would be appreciated. Thank you
Dorico Tabs Screen Shot.png

This has been mentioned a few times in this forum. See here for an example.