|Christian Studer 2017-11-30 00:00
You'll get this with some applications which use custom window title bars, for example Office 2016, to fix this go to UltraMon Options > Compatibility, then configure settings for the affected application and set the custom button spacing option. I would start with 50 pixels and adjust if necessary.
If this also happens with Microsoft Edge and File Explorer let me know.
Christian Studer - www.realtimesoft.com