Hello, in customizing aluminum doors and windows, custom-designed corner doors and windows can be operated in the following steps:

1. You can first place it directly diagonally in the 2D on the left window - bay window, corner bay.

 2. Select the entire aluminum door and window in 3D until it turns red, modify the corresponding size in the edit column on the right, and then click to enter: "2D Design" (Note: After clicking to enter 2D Design, you can no longer modify the size of the corner aluminum door and window)

 3. After clicking "2D Design", the left area entered is the left area of the corner door and window, and the right area is the right area of the corner door and window. You can select the outer frame style on the left area and drag it directly into the area. Then click on the upper bar to draw mullions. After drawing mullions, you can modify the corresponding door leaf size;

 4. Drag the movable sash style on the left into the drawn mullion frame, add the conversion frame, select the movable sash, and you can modify the corresponding glass parameters in the edit column on the right.