If some of you are using screen with High DPI Display and your client opens small. I found a temporary fix for Windows 10, I didn't see any threads with a solution.
Moderator please move thread and correct section, if this is the wrong area.
First:
Open OSBot Client, and then open System Task Manager(Right-Click your taskbar)
Second:
Right-Click Java TM Platform SE Binaray, and click Open File Location
Third:
Right-Click the java.exe file, and click Open Properties
Fourth:
Under Compatability, check box Override High DPI Scaling behavior
Fifth:
In the drop box below the check box, make sure its on 'System' instead of 'Application'.
Sixth:
Hit Apply, and then Ok, close your OSBot client and reopen. Now it should be scaled to your screen, Your Welcome :).