If your computer has a High DPI (4K) monitor, or if you are using multiple monitors, try these settings:

・Enable High DPI (Cubase)
Cubase Top Menu
[Edit] > [Preferences] > [General]
Check [Enable High DPI]

・Override high DPI scaling behavior (Windows)
Right click the Cubase shortcut icon
Select [Properties] at the bottom of the pop-up menu
Select [Compatibility] tab
Click [Change high DPI settings]
Check [Override high DPI scaling behavior]
Select [System] or [System (Enhanced)] from the pulldown menu
Click [OK] to close both dialogs
Restart the DAW using the modified shortcut