rotating entire ImGui window

Version/Branch of Dear ImGui:

Version 1.92

Back-ends:

imgui_impl_opengl3.cpp + imgui_impl_sdl3.cpp

Compiler, OS:

Clang

Full config/build information:

No response

Details:

I am developing an Android app using ImGui with SDL and OpenGL.

I have everything working together nicely so far.

The app is started in "portrait" mode, and the issue is that sometimes I need to fake being in "landscape" mode.

This is all fine for SDL and OpenGL because I can change the view transform matrix and projection transform matrix as needed.

How would I be able to rotate the ImGui window so that is faked being run in "landscape"?

I'm not asking about widget layout or anything like that.

I assume there is a low-level way to achieve this, but I could not find anything.

Screenshots/Video:

No response

Minimal, Complete and Verifiable Example code:

// Here's some code anyone can copy and paste to reproduce your issue
ImGui::Begin("Example Bug");
MoreCodeToExplainMyIssue();
ImGui::End();

Review imgui_impl_opengl3.cpp and imgui_impl_sdl3.cpp, then inspect the ImGui::Begin example in the issue. The report asks for a low-level way to rotate an entire ImGui window but does not identify an implementation location, test, or agreed API; first establish the supported scope and a concrete completion criterion.