Is your feature request related to a problem? Please describe.
Today we are not able to control the height of the Separator block.

Sometimes we might want the block to be shorter and other times taller. To have less or more space in the design.

Describe the solution you'd like
It would be helpful to duplicate the settings "height in pixels" from the Spacer block to the Separator block, so one can control the height. By controlling the height one would be able to create a greater flexibility in the design.

Here is an example from the Spacer block.

Describe alternatives you've considered
Using the Spacer block before/after the Separator block to give more space.
Spacer block
Separator block
Spacer block

Here is also an example from CoBlocks that @richtabor shared here:
#16483 (comment)

Associated overview issue: #16483