After a lot of tests to setup a correct display through the NeoloadGUI.exe properties I've not been able to use the GUI due to extra small text and almost invisible icon.
High Resolution mode disable or enable doesn't change the issue.
How to fix this for Windows 10?
When using Windows 8/10, and having display issues with Neoload, you can do the following to make the display better:
I had this issue today with a vmware fusion Windows10 and just wanted to share my findings, please see my resolution in the screenshot