This is undocumented but should do the trick. We may add this to the GUI at some point. It has MANY options including an option for making SlickEdit act exactly like visual studio ('N' - option but Smart next window style must be set to "Smart next window").
Create a macro file with the code below in it. Then run the command that it defines to change the find window option. This change won't move a document tab from one tab group to another but it will allow for duplicates to be created in the current tab group automatically.
#include "slick.sh"
_command void set_find_window_options_my_way()
{
// This is the default setting
//
// Visable current tab Group, Visible current Mdi window
// Visable Anywhere, current tab Group, current Mdi window, Anywhere
//_default_option(VSOPTIONZ_DEFAULT_FIND_WINDOW_OPTIONS,"VG,VM,VA,G,M,A");
//
// This is what you want
//
// current tab Group
_default_option(VSOPTIONZ_DEFAULT_FIND_WINDOW_OPTIONS,"G");
// Indicate config changed so option gets saved
_config_modify_flags(CFGMODIFY_OPTION);
}