I'm using QGis for years but suddenly I stuck with something that I'm sure it's an easy fix. Every time I start to create a new feature, the Advanced Digitizing tool window pops up. Do you know how to suppress it?
When starting a new digitizing session, try dragging the Advanced Digitizing window and dropping it into one of the other toolbar panes or under layers window, you may have to double-click once you have it in the desired position.
If that fails, under "View" tab go to "Toolbars" and untick "Advanced Digitizing".
UPDATE: under "View" tab go to "Panels" and untick "Advanced Digitizing", hopefully this will work.