Hi! This could be graphics related. Try the followings.
1) Make sure all critical Windows updates are installed and the graphics driver is updated.
2) Go to Windows Display settings -> select the recommended resolution and scale.
3) Right-click on Inventor desktop icon -> Properties -> Compatibility -> click on "Change High DPI settings" -> check both boxes.
Many thanks!
Johnson Shiue (johnson.shiue@autodesk.com)
Software Test Engineer