Hi,
As you have pointed out before, you can disable the suggestion popups via Tools->C/C++ (VisualGDB)->advanced->Code Completion->Suggest names while typing.
You can also try setting Tools->Options->Text Editor->C/C++(VisualGDB)->Advanced->Code Completion->Smart Suggestion List GUI to VS2019+ Native that is somewhat slower than the VisualGDB-provided one, but will work better on high-DPI displays.
You can disable the Code Explorer (Outline and Globals views) by unchecking the “Show window on startup” setting as shown here.