Windows 10 display looks too small

Can't this be related to your MacBooks high screen resolution. Try with zooming your display in Windows. Zooming will make everything on the screen larger and will hopefully make everything less small for you.

The setting is in the control panel and display/resolution settings.

Also, check out this answer from the Apple support forum that gives a more step by step instruction: Link

1. Right click on the desk and choose "Display settings"
2. Click on the "Advanced display settings" link
3. Click on the "Advanced sizing of text and other items" link
4. Click on the "set a custom scaling level" link in the "Change size of items" paragraph
5. Change to option in the drop down to 100%
6. Log out and log back in

From https://discussions.apple.com/message/28738491#28738491:

1. Right click on the exe file the choose Properties. Go to the Compatibility tab and check the "Disable display scaling on high DPI settings" box.

2. Then go to Settings->System->Advanced display settings-> Then change the resolution to 1920 x 1200.