Delphi + Andorra2d. How to make a transparent background?

Question

Delphi

I'm doing a screenshot. Before using Andorra 2d, character drawing was done on the native Canvas, however, after debugging, it was decided to switch to the above-mentioned graphics engine, which suits me completely. Except for one detail: before Andorra, 2d Transparent forms were applied on Canvas, thereby removing the entire form and leaving my character on the screen, which ran around the desktop and did not interfere with anyone. But this method does not work on Andorr, because it uses (in my case) OpenGl - which I didn't take into account. I tried to edit the engine itself, because. I know that it is possible to achieve a transparent background on OpenGl, but these attempts did not give any result. Desperate, I came here with the only question - how to make a transparent background in Andorra 2d?