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First troubleshooting steps:
1. Do Help > System Info to find the exact version of LR you're running. If it's not CC 2015.10.1, then you need to update to that version (the latest): Keeping Lightroom Up-to-Date . Note that LR often fools people into thinking they're on "the latest".
2. Reset LR's preferences: https://www.lightroomqueen.com/articles-page/how-do-i-reset-lightrooms-preferences/ . Sprinkling that magic fairy dust often fixes a wonky user interface.
Purchased my Dell Desktop recently, so it's a fresh new install.
1. Are you running CC 2015.10.1? Just because it's a "new install" doesn't ensure you have "the latest", unfortunately.
2. LR can corrupt its preferences at any time. Have you tried resetting them? Note that reinstalling doesn't reset preferences.