How to remove the white background of a symbol when outputting using OpenCascade's AIS_Textlabel?

I'm implementing a program for working with shapes using OpenCascade. Please help me remove the white background around a symbol when outputting symbols using OpenCascade's AIS_Textlabel. How can I remove the white background around a symbol?

Or is there another way to display text on the stage so that it lies in the plane of the size and does not turn towards the camera when the camera rotates and does not change size when zooming?

This is my code:

label = AIS_TextLabel() label.SetText(str(text)) label.SetPosition(gp_Pnt(*position)) label.SetHeight(height) label.SetDisplayType(1) label.SetHJustification(Graphic3d_HTA_CENTER) label.SetVJustification(Graphic3d_VTA_CENTER) if hasattr(label, "SetBackdrop"): label.SetBackdrop(False) color_obj = Quantity_Color(*color, Quantity_TOC_RGB) label.SetColor(color_obj) self._context.Display(label, False)

I want to remove the white rectangle around the number one:
enter image description here