Can't create any shape based on dimension

Hello there! I’m trying to create a shape (rectangle) based on dimension, but when I set the dimension in the box underneath (right) the dimension and the rectangle I am making, disappear. Coming back to the beginning. I would appreciate any help with this.

Thank you!

Are you clicking in the Measurements window after starting the rectangle? If so, don’t. Click and release to set the first corner, move the cursor in the general direction of the diagonal, let go of the mouse and type the desired dimensions in exactly the same format as the numbers displayed. Commac or semicolon as the separator the same as shown.