Hi Ravi,
It seems that your screen resolution is very low. 'Lenvica HRMS' requires a minimum resolution of '1024 X 768' pixels.
Kindly check your resolution by right-clicking on your desktop and selecting 'Properties' from the popup menu.
In case, if you are not able to increase your screen resolution, i've one more solution for selecting the 'OK' button in the 'Formula Editor' window, that is to use the following shortcut keys:
Alt + O = Ok
Alt + C = Cancel
Alt + V = Verify
I hope this helps. In case, if you continue to have problems, please inform us, we will help you online.
Thanks
Natraj