Reduce your text and display scaling to 100% so you can see the email and password fields.
https://support.microsoft.com/en-us/windows/change-your-screen-resolution-and-layout-in-windows-5effefe3-2eac-e306-0b5d-2073b765876b
I don't think the simulation has any knowledge of these things (assuming you're referring to the CL650's fuel truck and not the sim's "ground services").
Try enabling the "Zink plugin bridge" in X-Plane's Graphics settings. And if still an issue upload your Log.txt from the simulator's install directory, please.