Hi,
Most of the VisualGDB’s settings are stored in registry under HKEY_CURRENT_USER\Software\Sysprogs\VisualGDB\Settings, so you can delete the subkeys of this key (don’t delete the key itself, as it would break the license-related logic and make VisualGDB unusable on that machine).
The only subset of settings not affected by this is Tools->Options->Text Editor->C/C++ (VisualGDB)->General/Scroll Bars/Tabs as those settings are managed by Visual Studio itself. The easiest way to reset those 3 tabs is to simply copy the values from any other language (e.g. regular C/C++).