ImGui remove unnecessary elements

enter image description hereI wrote authorization by key in imgui, then I made an injection and a game selection (but it opened in a new window) I would like to make sure that after successful authorization, the old elements are deleted and new ones are drawn without adding a new window

made different windows but the authorization window did not close and it looked ugly

ImGui::SetNextWindowSize(ImVec2(284, 309));
    if (ImGui::Begin("sd1", NULL, ImGuiWindowFlags_NoResize | ImGuiWindowFlags_NoScrollbar | ImGuiWindowFlags_NoCollapse | ImGuiWindowFlags_NoSavedSettings))
    {
        ImGui::InputText("##keyinput", &inputlicencekey, CHAR_MAX, ImGuiInputTextFlags_Password);

        if (ImGui::Button("Login"))
        {
            if (&inputlicencekey == key)
            {
                logged = true;
            }
        }
    }ImGui::End();

    ImGui::SetNextWindowSize(ImVec2(284, 309));
    if (!logged && ImGui::Begin("sd1", NULL, ImGuiWindowFlags_NoResize | ImGuiWindowFlags_NoScrollbar | ImGuiWindowFlags_NoCollapse | ImGuiWindowFlags_NoSavedSettings))
    {
            ImGui::Checkbox("Test", &testbool);
            if (ImGui::Button("injcet"))
            {
                testbool = true;
            }
            ImGui::Text("Int");
            ImGui::SliderInt("##dd", &inttest, 0.1f, 15.f);
            ImGui::Text("Float");
    }ImGui::End();

Change the first line of code to

if (!logged && ImGui::Begin(...))

such that the window only renders if logged is not set.

Better still, consider adding a state variable:

// at top level
enum class State { START, LOGGED_IN };
State my_state = State::START;

and then your rendering code can inspect my_state:

switch (my_state) {
  case State::START: {
    ImGui::Begin(...);
    ...
    my_state = State::LOGGED_IN;
    break;
  }
  case State::LOGGED_IN: {
    ImGui::Begin(...)
    ...
    break;
  }
}

Here is the exact change you need to make:

    if (!logged && ImGui::Begin("sd1", NULL, ImGuiWindowFlags_NoResize | ImGuiWindowFlags_NoScrollbar | ImGuiWindowFlags_NoCollapse | ImGuiWindowFlags_NoSavedSettings))
    {
        ImGui::InputText("##keyinput", &inputlicencekey, CHAR_MAX, ImGuiInputTextFlags_Password);

        if (ImGui::Button("Login"))
        {
            if (&inputlicencekey == key)
            {
                logged = true;
            }
        }
    ImGui::End();
    }

    ImGui::SetNextWindowSize(ImVec2(284, 309));
    if (logged && ImGui::Begin("sd1", NULL, ImGuiWindowFlags_NoResize | ImGuiWindowFlags_NoScrollbar | ImGuiWindowFlags_NoCollapse | ImGuiWindowFlags_NoSavedSettings))
    {
            ImGui::Checkbox("Test", &testbool);
            if (ImGui::Button("injcet"))
            {
                testbool = true;
            }
            ImGui::Text("Int");
            ImGui::SliderInt("##dd", &inttest, 0.1f, 15.f);
            ImGui::Text("Float");
    ImGui::End()
    }