Tabbar containing dockspace about imgui HOT 8 CLOSED

You should pass a size to DockSpace() to correctly leave room for a tab bar, otherwise by default DockSpace() will use all remaining space. Probably the right size to use is ImVec2(0.0f, -ImGui::GetFrameHeightWithSpacing())`.

It fixes the problem with unwanted scrollbars. Now I can see tabs at the bottom of the screen without scrolling

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You should pass a size to DockSpace() to correctly leave room for a tab bar, otherwise by default DockSpace() will use all remaining space.
Probably the right size to use is ImVec2(0.0f, -ImGui::GetFrameHeightWithSpacing())`.

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If you want the tab bar to be above the DockSpace() then submit the tab-bar before the DockSpace().

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When I submit tabbar along with all sub windows before I define dockspace and its settings, it breaks. Tabs are shown in expected position but windows are floating and not docked to anything

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Oh, I got your point. I can read BeginTabBar into a bool variable, then define dockspace and only then define actual windows

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I cannot understand your question without actual code.
Dockspace needs to be submitted before any window that may be docked into it.
see Examples->Documents for an example.

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Yeah, thanks, I've figured out how to make tab bar right way

I used this approach in Imgui

// MenuBar
// Dockspace
if (BeginTabBar()) {
   // Draw windows
}

But instead I needed to use this one

// MenuBar
bool tabBarStarted = BeginTabBar();
// Dockspace
if (tabBarStarted) {
   // Draw windows
}

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I think the right pattern you may be looking for is:

if (BeginTabBar(....)
{
    DockSpace(...);
    DrawWindows();
    EndTabBar();
}
else
{
   DockSpace(..., ImGuiDockNodeFlags_KeepAliveOnly);
}

Keeping the dockspace alive ensure windows don't get undocked if other windows than DrawWindows() are docked into this DockSpace(). Otherwise if a DockSpace() stops being alive, all its windows will get undocked.

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