I've installed X8 on several computers, different companies, different configurations, and I never see this problem. Maybe your screen was not right or use big display resolution (remember, Ctrl and + / Ctrl and - are relative to your computer only, then it seems just a local issue). The System Requirements of the program indicates that is needed "1280 x 720 screen resolution at 100% (96 dpi)", then if you use lower resolution you will see the interface too big
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