It seems like a machine specific bug. Though we have indeed heard of the similar issue in the past releases as well but there are no concrete steps available. In the meanwhile, can you share the screenshot showing the below scenarios ?
1. When the no document is opened
2. When a document is opened.
- Which version of InDesign are you running?
- Also what type of monitor are you using? Is it a high-resolution or retina display?
- Additionally is your computer connected to more than one display?