You can, but not exclusively for RAH only - You can change your PC Display Font but ALL fonts will be affected but I often find increasing the font across the board is helpful as it can all be very small!.
Another suggestion is to switch between standard & full screen mode by pressing the F11 key on your keyboard. This allows you to make full use of the screen space.
Shaz Hughes Dip(Fin) ACQ NSW, MICB
Reckon Accredited Professional Partner Bookkeeper / Registered BAS Agent (No: 92314 015)
Accounted 4 Bookkeeping Services
0422 886 003