Dimension Question

 

How does the size of the move down???

You're sentence it's not very English.
But, if you need move down the dimension text, you can used the model editor

hello Soso,

to move down will be false dimension, but the correct way is to move up as value 450mm, so just simple clic on value 150 and write on command windows dtof 0 3
and if it's not ok the new position you can write again dtof 0 4 ....