How to use beyond to rotate around a point

[jujun]

Hi
Looking at the attached picture, I want to rotate the rectangle 90 degrees around the red position in the lower right corner, but after I adjust the final state, it is another way of rotation. Who knows if there is any good way? Instead of entering edit mode, adjust the graph at the origin

 

[Igor Strakhov]

Hi, Jujun!

If you want the rotation around the lower right corner from the very beginning, you must move the key point with the specified coordinates of the center of rotation to the very beginning.
Then set a new key in the middle with the same center point values and a new rotation angle value